VO2Max Hiit Workout vs Feint Interval Trainer

Science-based HIIT protocols to boost your VO2Max. Built by athletes, precise to the second. Increase your VO2Max with science-backed interval training protocols used by elite athletes. Proven protocols following the latest (or oldest) research papers Norwegian 4x4, Tabata, Wingate, and conventional HIIT workouts designed to maximize aerobic capacity. Built and used by athletes that seek to improve their performance (VO2Max or regular calisthenics). Timers accurate to the second—no 10-second delays that throw off your intervals like most apps. 18% less battery drain than competing apps. Train longer without worrying about your phone dying mid-workout. Fully Customizable (adjust any protocol or any workout) Adjust work/rest intervals, rounds, and intensity to match your fitness level and goals. What you'll find in this app : VO2Max, HIIT, various interval trainings, Norwegian 4x4, Conventional (60/60) Tabata (20/10), Wingate (30/240), aerobic fitness, endurance training, cardio workouts

Train by the clock, not against it. Feint is a round and interval timer for people who actually train — fighters, lifters, runners — built to be reliable, customizable, and equally at home on your iPhone and Apple Watch. Randomize your interval lengths to maximize output and effort — no more easing off as you get close to the end of a round. WHY FEINT • Timing you can trust — the timer is anchored to the wall clock, so it stays accurate even when your phone locks or backgrounds. It never drifts, and your rounds end exactly when they should. • Tackle psychology — intervals can be randomized so you don't start easing off knowing you're nearing the end of a round. Maximum effort from beginning to end. • It lives on your wrist — independent Apple Watch companion, not a mirror. It runs your workout with a haptic cue for every transition and counts as a real workout toward your activity rings. • Controls without unlocking — a Live Activity puts a running countdown and a play/pause control on your Lock Screen and in the Dynamic Island. • Workouts built your way — compose sessions from labeled phases, each with its own color, duration, and audio cue. Choose a fixed number of rounds, a target duration, or a continuous session. Add a "Get Ready" countdown, tune the beep tone and waveform, and set a backdrop per profile. • Audio you can hear over your music — crisp synthesized cues that can duck your music or podcast just enough to be heard, and keep firing while the screen is off. • See your progress — a streak calendar and weekly-volume charts turn finished sessions into momentum, including the ones you ran on the watch. • Yours, and private — everything stays on your device. No accounts, no tracking, nothing collected. Share a profile with a training partner as a simple file whenever you want. BUILT FOR Boxing and kickboxing rounds · BJJ and grappling rolls · HIIT and Tabata circuits · running and rowing intervals · HEMA / sword drills · and anyone who trains in timed rounds. PRICING Try every built-in workout for free. A one-time unlock — Feint Pro, no subscription — opens up custom profiles and the Apple Watch app.