VO2 Max Helper

VO2 Max Intervals turns interval training into something you actually stick with — real protocols, not just a countdown timer. TRAIN WITH REAL PROTOCOLS Choose from a library of interval sessions grounded in real training science: - Norwegian 4x4 — the gold-standard VO2max protocol - Billat 30/30 and 15/15 intermittent — high time-at-VO2max intervals - Tabata — 20 seconds on, 10 off, all-out - Micro-Bursts 30/15 — a cyclist favorite - Long Intervals 5x5 — bigger aerobic volume - Round-based combat sport timers: Boxing, Muay Thai, and MMA BUILD YOUR OWN Set your own warm-up, work interval, recovery, rounds, and cool-down, then save it for next time. As many custom protocols as you want. TRAIN WITH REAL NUMBERS - Connect any Bluetooth heart rate strap, or use your Apple Watch - See your live heart rate during every round - Look up your estimated heart rate training zones from your age - Every session is logged automatically to your workout history DESIGNED TO DISAPPEAR INTO YOUR WORKOUT - Full-screen countdown with voice and audio cues for every phase change - Live Activity on your Lock Screen, so you never have to unlock your phone mid-round - Apple Health sync for completed workouts - Light and dark themes - English, French, German, and Sinhala language support No account, no setup — open the app and start your interval.