Supported Features
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Dark Interface
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Differentiate Without Color Alone
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Sufficient Contrast
Flex - Redefine Strength
Your personal gym app
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Flex is the training companion built for people who take their workouts seriously. Whether you're running circuits, timing intervals, or logging kilometers (or miles), Flex keeps you locked in so you can focus on the work, not the stopwatch. Build custom workouts with exercises, sets, and rest periods tailored exactly to how you train. Start a timer and let Flex handle the countdowns, transitions, and cues while you push through every rep. Track running, walking, hiking, cycling, rowing, HIIT, yoga, and rollerblading with full GPS routes, pace, elevation, and calories, all in one place. Pair with Apple Watch for live heart rate throughout your session, then dive back into your history afterward to see exactly how each set and each exercise felt, down to the beat. Your training lives on your terms. Sign in with an account and your data syncs quietly across every device you own, always available, always yours. Flex isn't about logging workouts. It's about understanding your performance well enough to keep improving it.
Flex Emerald unlocks the full experience with an auto-renewing subscription, available monthly or annually. See in-app for current pricing.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
This version includes bug fixes and improvements.
Thank you for using Flex.
Let's Redefine Strength together.
The developer, David Kelen, 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 Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Location
- Contact Info
- Identifiers
- Sensitive Info
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- David Kelen
- Size
- 55.5 MB
- Category
- Sports
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later. - Apple Watch
Requires watchOS 10.6 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
English and 11 more
- English, Croatian, Czech, Danish, French, German, Hungarian, Italian, Polish, Portuguese, Russian, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Flex - Emerald | Monthly $6.99
- Flex - Emerald | Yearly $69.99
- Copyright
- © Dávid Kelen