SENTINEL
is a mobile app that helps you build a consistent fitness habit by learning your routine and scheduling AI-powered workouts at the best times.
Time: 1 month
User Research & Visual Design
A smart fitness app
that adapts to you.
Feel It Today
Build for Tomorrow
SENTINEL
is a mobile app that helps you build a consistent fitness habit by learning your routine and scheduling AI-powered workouts at the best times.
Time: 1 month
User Research & Visual Design
Desk Research
Findings
58.0%
of Americans exercise min 3 times per week.
30.0%
prefers walking as exercise.
Lack of time
is the primary barrier to exercise.
Uncertainty
is a common struggle when starting to exercise.
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Desk Research
Findings
58.0%
of Americans exercise min 3 times per week.
30.0%
prefers walking as exercise.
Lack of time
is the primary barrier to exercise.
Uncertainty
is a common struggle when starting to exercise.
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Desk Research
Findings
58.0%
of Americans exercise min 3 times per week.
30.0%
prefers walking as exercise.
Lack of time
is the primary barrier to exercise.
Uncertainty
is a common struggle when starting to exercise.
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Desk Research
Findings
58.0%
of Americans exercise min 3 times per week.
30.0%
prefers walking as exercise.
Lack of time
is the primary barrier to exercise.
Uncertainty
is a common struggle when starting to exercise.
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Fitness, and mindfulness
classes.
Videos with top instructors.
Detailed metrics and route planning.
Offline Access
No free tier
No live class available
Enables to share progress.
Multi-Sport Tracking
Detailed metrics and
route planning.
Allows competition
Advanced features
require subscription.
Limited indoor options.
#
120+ million users
Audio-Based Workouts
Extensive Library
Offline Access
Motivational Coaching
No free tier
Lack of Visuals
Limited social engagement
#
10+ million users
Desk Research
Findings
58.0%
of Americans exercise min 3 times per week.
30.0%
prefers walking as exercise.
Lack of time
is the primary barrier to exercise.
Uncertainty
is a common struggle when starting to exercise.
x
8
User Interviews
Equipment-Free Workouts
AI-driven customised workout plans.
Includes both fitness and nutrition advice.
Time-Efficient
Lacks social and gamification
elements.
#
55+ million users
#
#
#
#
Competitive
Analysis
Desk Research
Findings
58.0%
of Americans exercise min 3 times per week.
30.0%
prefers walking as exercise.
Lack of time
is the primary barrier to exercise.
Uncertainty
is a common struggle when starting to exercise.
x
8
User Interviews
Equipment-Free Workouts
AI-driven customised workout plans.
Includes both fitness and nutrition advice.
Time-Efficient
Lacks social and gamification
elements.
#
55+ million users
#
#
#
#
Competitive
Analysis
Desk Research
Findings
58.0%
of Americans exercise min 3 times per week.
30.0%
prefers walking as exercise.
Lack of time
is the primary barrier to exercise.
Uncertainty
is a common struggle when starting to exercise.
x
8
User Interviews
Equipment-Free Workouts
AI-driven customised workout plans.
Includes both fitness and nutrition advice.
Time-Efficient
Lacks social and gamification
elements.
#
55+ million users
#
#
#
#
Competitive
Analysis
Desk Research
Findings
58.0%
of Americans exercise min 3 times per week.
30.0%
prefers walking as exercise.
Lack of time
is the primary barrier to exercise.
Uncertainty
is a common struggle when starting to exercise.
x
8
User Interviews
Equipment-Free Workouts
AI-driven customised workout plans.
Includes both fitness and nutrition advice.
Time-Efficient
Lacks social and gamification
elements.
#
55+ million users
#
#
#
#
Competitive
Analysis
Problem
Struggling to find the right time to work out and not knowing what to do when exercising.
Problem
Struggling to find the right time to work out and not knowing what to do when exercising.
Problem
Struggling to find the right time to work out and not knowing what to do when exercising.
Click for persona 2
Click for persona 1
Sarah Brook
(Persona 1)
26
Data Scientist-USA
Conscious Beginner
Motivations
Health progress, and balance,
with support, tracking,
and an energy boost.
Goal
Build a consistent habit
for better health and recovery.
Challenges
Quits due to no results
Overwhelmed where to start
Struggles with consistency
Click for persona 2
Click for persona 1
Alex Brown
(Persona 2)
32
Finance-USA
Hectic Scheduler
Motivations
Increased energy, seeing results
and feeling support.
Goal
Feel healthier, balance life,
boost energy and mood.
Challenges
Lack of time,
Inconsistent routine
Exhaustion after a long day.
Click for persona 2
Click for persona 1
Sarah Brook
(Persona 1)
26
Data Scientist-USA
Conscious Beginner
Motivations
Health progress, and balance,
with support, tracking,
and an energy boost.
Goal
Build a consistent habit
for better health and recovery.
Challenges
Quits due to no results
Overwhelmed where to start
Struggles with consistency
Click for persona 2
Click for persona 1
Alex Brown
(Persona 2)
32
Finance-USA
Hectic Scheduler
Motivations
Increased energy, seeing results
and feeling support.
Goal
Feel healthier, balance life,
boost energy and mood.
Challenges
Lack of time,
Inconsistent routine
Exhaustion after a long day.
Click for persona 2
Click for persona 1
Sarah Brook
(Persona 1)
26
Data Scientist-USA
Conscious Beginner
Motivations
Health progress, and balance,
with support, tracking,
and an energy boost.
Goal
Build a consistent habit
for better health and recovery.
Challenges
Quits due to no results
Overwhelmed where to start
Struggles with consistency
Click for persona 2
Click for persona 1
Alex Brown
(Persona 2)
32
Finance-USA
Hectic Scheduler
Motivations
Increased energy, seeing results
and feeling support.
Goal
Feel healthier, balance life,
boost energy and mood.
Challenges
Lack of time,
Inconsistent routine
Exhaustion after a long day.
Value Proposition
Value Proposition
Sentinel learns your daily routine and suggests the best workouts at the right time for you.
Sentinel learns your daily routine and suggests the best workouts at the right time for you.
SENTINEL
1h ago
Time for a Boost: Have Time After Work?
Free spot after work!
Add a 50-min low-intensity cardio at 7:15 PM?
Add to schedule
Maybe Later
SENTINEL
15m ago
6:30 PM looks calm. 25-min HIIT & you're done!
Value Proposition
Sentinel learns your daily routine and suggests the best workouts at the right time for you.
SENTINEL
1h ago
Time for a Boost: Have Time After Work?
SENTINEL
1h ago
Time for a Boost: Have Time After Work?
Free spot after work!
Add a 50-min low-intensity cardio at 7:15 PM?
Add to schedule
Maybe Later
Free spot after work!
Add a 50-min low-intensity cardio at 7:15 PM?
Add to schedule
Maybe Later
SENTINEL
15m ago
6:30 PM looks calm. 25-min HIIT & you're done!
Design System
Fonts
Font: 2
SF Pro
AaBbCc
Juxtaposing sleek typography with vibrant hues, the quirky zebra dances
amidst carefully crafted patterns.
0123456789
SF Pro/Bod
SF Pro/Title 2
SF Pro/Small Paragraph
White Smoke
100
#f6f6f6
500
#ececec
Black Tristesse
100
#203e5c
Cigarette Fizz
100
#fda580
200
#ff6700
Spacing
SPACING
#2XS
4
#S
16
#L
24
#XL
32
#5XL
64
Design System
Fonts
Font: 2
SF Pro
AaBbCc
Juxtaposing sleek typography with vibrant hues, the quirky zebra dances
amidst carefully crafted patterns.
0123456789
SF Pro/Bod
SF Pro/Title 2
SF Pro/Small Paragraph
White Smoke
100
#f6f6f6
500
#ececec
Black Tristesse
100
#203e5c
Cigarette Fizz
100
#fda580
200
#ff6700
Spacing
SPACING
#2XS
4
#S
16
#L
24
#XL
32
#5XL
64
Usability Testing
Usability Testing
I carried out a remote usability test and expert review to evaluate how user-friendly the service is.
I carried out a remote usability test and expert review to evaluate how user-friendly the service is.
POSITIVE FEEDBACK
POSITIVE FEEDBACK
Covers all key user pain points.
Covers all key user pain points.
Covers all key user pain points.
Progress tracking is clear and detailed.
Progress tracking is clear and detailed.
Progress tracking is clear and detailed.
PAIN POINTS
Dashboard feels overwhelming.
Dashboard feels overwhelming.
Dashboard feels overwhelming.
Profile section is confusing.
Profile section is confusing.
Profile section is confusing.
Too many workout options are intimidating.
Too many workout options are intimidating.
Too many workout options are intimidating.
Daily caloric intake is confusing and not needed.
Daily caloric intake is confusing and not needed.
Daily caloric intake is confusing and not needed.
Streamlined the dashboard, moved exercises to a dedicated screen, and removed the community section for a cleaner, more user-friendly experience.
Streamlined the dashboard, moved exercises to a dedicated screen, and removed the community section for a cleaner, more user-friendly experience.
Streamlined the dashboard, moved exercises to a dedicated screen, and removed the community section for a cleaner, more user-friendly experience.
Replaced basic info with performance stats, added motivational messages, and included a 90-day weight graph for better progress tracking.
Replaced basic info with performance stats, added motivational messages, and included a 90-day weight graph for better progress tracking.
Replaced basic info with performance stats, added motivational messages, and included a 90-day weight graph for better progress tracking.
Product Highlights
Product Highlights
Smart Calendar Integration
The Smart Calendar Integration solves the challenge of not enough time by syncing with the user’s phone calendar to identify the best time slots for workouts. By analyzing their schedule and availability, it ensures workouts fit seamlessly into their day without disrupting other commitments.
It addresses complexity overload by eliminating the need for manual planning. Users can rely on the app to automatically suggest workouts that align with their routine, simplifying the entire process.
Problem it solves: Not Enough Time, Complexity Overload
Problem it solves: Not Enough Time, Complexity Overload
Challenges
Challenges keep users motivated with weekly and personalized goals, rewarding progress with points and leaderboard rankings. Showing participant numbers fosters community, healthy competition, and deeper app engagement.
Problem it solves: Lack of Motivation, Social Isolation
Problem it solves: Lack of Motivation, Social Isolation
Exercises
The Exercises section offers personalized workout recommendations, making it easy to find the best routines. Daily guidance reduces decision fatigue, keeps users consistent, and boosts long-term engagement.
Problem it solves: Unclear Guidance, Lack of Motivation
Problem it solves: Unclear Guidance, Lack of Motivation
Inclusive Design
Sentinel is for everyone, offering hands-free access so no one is left out! Simply hold the side button for 3 seconds to activate the hands-free experience.
Check out EcoQuest
Check out EcoQuest!
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Case study project on designing a gamified mobile app that rewards eco-friendly actions with real-life incentives.
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Case Study
Case study project on designing a gamified mobile app that rewards eco-friendly actions with real-life incentives.