100 Days to Fit
Complete Health & Wellness
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Now with heart rate monitor support: connect any Bluetooth strap or watch, see your zones live, and save each workout's average, max and time in zone.
100 Days to Fit is a science-based fitness program built for people who want real, personalized results — not generic workout plans.
Rather than one-size-fits-all routines, 100 Days to Fit calculates your unique baseline using your body metrics and current fitness level, then builds a fully personalized 14-week periodized program around it — covering strength training, cardio, mobility, and nutrition.
HOW IT WORKS
- Measure — Enter your body metrics (age, height, weight, and primary goal) to establish your baseline.
- Test — Complete a PAR-Q health screening and baseline strength/cardio testing (sample lifts and a 5KM time) to calibrate your personalized targets.
- Start — Instantly see your calculated BMR, TDEE, calorie targets, and heart rate zones — all built from your own data.
FULL PROGRAM FEATURES
- A complete 14-week periodized strength and cardio schedule, structured week by week
- A macro-based nutrition system with calorie targets and recipe/meal prep guidance
- Mobility protocols to support recovery and long-term movement health
- Progress tracking to log workouts and monitor results over time
- Clear, animated exercise demonstrations for proper form on every movement
DESIGNED WITH A STOIC MINDSET
100 Days to Fit pairs its training system with Stoic philosophy for motivation — helping you build discipline and consistency, not just chase short-term results.
SIMPLE, ONE-TIME PRICING
Explore the app for free, then unlock the full 14-week program with a single one-time purchase — no subscriptions, no recurring charges.
No account or sign-in required. All your data stays on your device.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
NEW: Heart rate monitor support
• Connect any Bluetooth heart rate strap, arm band or watch that broadcasts heart rate (Garmin, Magene, Polar, Wahoo and more).
• Cardio days: your live heart rate shows next to your zone target, which turns green when you're in zone and red when you're out once the timer starts.
• Every workout day: a live heart rate display and a Record button. Tap Record, or press Start on a timer while connected, to save your average, max and time in each zone.
• Your monitor is remembered and reconnects automatically. Heart rate monitoring is completely optional.
CARDIO SCHEDULE
• Cardio days now run Tuesday (Tempo), Thursday (Intervals), Saturday (Long Run) and Sunday (Mobility). The workouts themselves are unchanged.
STRETCHING
• Reviewed the strength-day and run-day cool-downs so each stretch matches the muscles you just trained.
• New Open-Book rotation for the lower back.
• Added the missing stretch images to the Wednesday cool-down.
• "Back Extension" is now "Back Hyperextension".
EXERCISE POP-UPS
• Cleaner, more professional exercise detail pop-ups for the warm-up, workout and cool-down.
NUTRITION AND SHOPPING LIST
• Shopping list now combines matching ingredients across all of your selected recipes (for example, all onions or all cherry tomatoes appear once, with the total).
• Added the missing amounts for garlic, ginger, lime and spices.
• Rolled and steel-cut oats are now one item, and cherry tomatoes are used throughout.
• Recipe wording and portion fixes.
Plus assorted polish and bug fixes.
The developer, Darwin Roscoe, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Darwin Roscoe
- Size
- 65.6 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- 100 Days to Fit $24.99
- Copyright
- © 2026 Darwin Roscoe
