Strandis
A sleek fitness tracking app with bold neon aesthetics. Designed to turn casual gym-goers into consistent athletes through intuitive progress tracking, personalized workouts, and achievement systems.
Role
Lead Product Designer
UX Strategy, Visual Design, Motion
Timeline
12 weeks
Impact
+215% User Growth
4.9
App Store Rating
Top 10 Health892K
Active Users
+215%67%
Weekly Retention
+34ptsTL;DR
A fitness app with 280K downloads had only 33% weekly retention — users would download, try once, then abandon. The workout logging felt tedious and social features were underutilized.
Lead Product Designer — led UX strategy, designed the gamification system, created the visual design system, and prototyped 60+ micro-interactions across a 12-week engagement.
Weekly retention doubled to 67%, active users grew +215% to 892K, and the app hit 4.9 stars with Top 10 Health ranking — measured via Firebase Analytics over 10 weeks.
THE CHALLENGE
Fitness apps fail because they feel like work
Most fitness apps treat users like data entry clerks. Logging workouts was tedious, progress felt invisible, and there was no compelling reason to come back tomorrow. We needed to make fitness feel like a game, not a chore.
- 33% weekly retention — users dropped off after first week
- Average session time under 2 minutes
- Social features used by only 8% of users
- No emotional connection to progress
33%
Weekly retention
1.8m
Avg session time
8%
Social feature usage
3.4★
App store rating
BEHAVIORAL PSYCHOLOGY
The Science of Habit Formation
Fitness apps fail at staggering rates. Studies show that 95% of users abandon fitness apps within 90 days. The problem isn't motivation—it's that these apps are designed for already-motivated people, not for building habits in those who aren't.
Design Philosophy
"We didn't design a fitness app. We designed a habit machine that happens to be about fitness."
Behavioral Research Foundations
I studied BJ Fogg's Behavior Model, Nir Eyal's Hook Model, and James Clear's habit loop research. Three principles emerged as critical for fitness app retention:
Variable Rewards
Predictable rewards lose their power. We implemented randomized achievement unlocks and surprise milestones that kept users checking back.
Social Accountability
Humans are tribal. We're more likely to show up when others are watching. Weekly challenges with friends created gentle peer pressure.
Progress Visibility
Fitness improvements happen slowly. We needed to surface micro-progress—small wins that compounds into lasting habits.
User Archetypes
Through interviews with 32 users across different fitness levels, I identified three distinct archetypes we needed to design for:
THE RESTARTER
Has tried and quit multiple fitness apps. Needs a system that doesn't punish missed days.
THE COMPETITOR
Motivated by beating others. Needs leaderboards, challenges, and bragging rights.
THE ACHIEVER
Collects badges and completions. Needs a rich achievement system and visible progress.
The Streak Dilemma
Traditional streak systems have a fatal flaw: miss one day and lose everything. This creates anxiety and often causes users to abandon the app entirely after breaking a streak. We redesigned the system with forgiveness built in.
DESIGN DECISION
"Streak Shields" allow users to protect their streak once per week. If they miss a day, they can complete a makeup workout within 48 hours to restore it. This reduced streak-break abandonment by 67%.
THE SOLUTION
Gamification that creates healthy habits
We redesigned the app around psychological principles—variable rewards, social accountability, and visible progress—to make fitness genuinely addictive.
Smart Workout Tracking
AI-powered exercise detection automatically logs reps, sets, and form quality using phone sensors.
Health Sync Integration
Seamless connection with Apple Health, Google Fit, and 40+ wearable devices for comprehensive tracking.
Social Challenges
Compete with friends in weekly challenges. Leaderboards and achievements drive engagement.
Gamified Progress
Earn badges, unlock achievements, and level up your fitness avatar as you hit milestones.
GAMIFICATION SYSTEM
Designed for habit formation
Streak System
Daily streaks with escalating rewards keep users coming back. Missing a day doesn't reset—you can earn it back.
12 day avg streak
Achievement Badges
50+ unlockable achievements celebrate milestones—from first workout to 1000 pushups lifetime.
23 badges/user avg
Social Challenges
Weekly challenges against friends with real-time leaderboards drive friendly competition.
78% participation
APP SCREENS
Key Interactions
Onboarding
Bold brand introduction with clear CTAs
Dashboard
At-a-glance stats with progress tracking
Achievement
Celebratory moments that reinforce habits
Workout Guide
Visual exercise tutorials with progress
Workout Library
Curated exercises with save functionality
THE RESULTS
From downloads to daily habits
+215%
User Growth
280K to 892K
67%
Weekly Retention
Up from 33%
4.9★
App Rating
Top 10 Health
8.5min
Avg Session
Up from 1.8min
"Simeon's gamification system changed everything. Our users don't just open the app—they're competing with friends, chasing streaks, and actually getting fit. Retention doubled in the first month."
Jessica Lee
CEO, Strandis
THE PROCESS
12-week transformation
Discovery
2 weeks
- User interviews (n=32)
- Competitor analysis
- Fitness journey mapping
- Persona development
Ideation
3 weeks
- Design sprints
- Concept testing
- Feature prioritization
- Technical feasibility
Design
5 weeks
- Interaction design
- Visual design system
- Animation prototypes
- Accessibility review
Validation
2 weeks
- Beta testing (500 users)
- Performance optimization
- Analytics implementation
- Launch preparation
TOOLS USED
NEXT PROJECT
Velocity 2.0