Flex - Redefine Strength

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/