fitn3s
Get stronger in 15 minutes a day
The story
Overview
fitn3s is a mobile fitness app designed for busy people who want to build strength without a gym or equipment. It delivers a new 15-minute bodyweight workout every morning, automatically adjusted to your fitness level across a 40-level scale. The app addresses three common reasons people quit fitness: friction (no gym needed), decision fatigue (the plan is ready when you open it), and lack of visible progress (you can see your level increase as you get stronger). The core mechanism is progressive overload: when you hit a target exercise 3 times, the difficulty increases automatically. Daily streaks and 20+ achievement badges provide behavioral motivation grounded in habit-formation science, with research showing it takes 66 days for a workout to feel automatic. You start with a quick 4-minute fitness assessment (push-ups, wall sit, squats) that sets your baseline, ensuring day one feels achievable. The workout generator creates different exercise combinations daily to maintain engagement, and the app tracks your progress through a fitness profile and monthly retests.
Key features
Daily Adaptive Workouts
New 6-12 exercise combinations every morning, automatically adjusted to your current fitness level on a 40-level scale.
No Equipment Required
Pure bodyweight exercises you can do anywhere, anytime, with no gym membership or gear needed.
Progressive Overload
Exercises automatically increase in difficulty when you hit a target 3 times, building strength without manual adjustment.
Streak and Badge System
Daily streaks and 20+ achievement badges provide motivation to maintain consistency, leveraging habit-formation science.
Fitness Level Assessment
A quick 4-minute test (push-ups, wall sit, squats) establishes your starting point so workouts feel appropriately challenging.
Monthly Progress Tracking
Retest your fitness level each month to see measurable improvement across upper body, lower body, and endurance.
Use cases
- 1
Busy Parents
Fit strength training into a hectic schedule with 15-minute workouts that require no setup, gym time, or equipment.
- 2
Home Fitness Enthusiasts
Build consistent strength training habits at home without machines, weights, or expensive memberships.
- 3
Habit Builders
Use daily streaks and badges to establish a sustainable fitness routine that becomes automatic after 66 days.
- 4
Travelers
Maintain strength training while traveling with workouts that need only your bodyweight and a small space.
FAQ
How long are the workouts?
Each workout takes approximately 15 minutes and consists of 6-12 bodyweight exercises that change daily.
Do I need equipment or a gym?
No. fitn3s uses only bodyweight exercises, so you can work out anywhere without any gear or gym membership.
How does the difficulty increase?
The app uses progressive overload: when you complete a target exercise 3 times, it automatically increases the difficulty. Your fitness level is tracked on a 40-level scale.
What is the fitness test?
A 4-minute assessment using push-ups, a wall sit, and squats to determine your starting fitness level and ensure workouts are appropriately challenging.
How do streaks and badges work?
Daily streaks encourage consistency, and 20+ badges reward milestones like hitting body-part goals and maintaining weekly commitment. Research shows this habit-formation approach helps workouts feel automatic after 66 days.
Tech stack & tags
Feedback & Discussion
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