Run every HIIT and Tabata interval from your wrist — no iPhone required. HIIT is a standalone Apple Watch interval timer built for people who want to train hard without stopping to check their phone. Set custom work/rest rounds, feel haptic cues on every transition, and track heart rate and calories in real time. WHY ATHLETES CHOOSE HIIT • Standalone on Apple Watch — start, train, and finish without your phone • Custom intervals — work, rest, warmup, cooldown, and round count • Haptic & audio alerts — know when to push and when to recover, eyes-free • Live heart rate — see effort on your wrist during every interval • Health app sync — workouts saved automatically for your training history • Watch complication — launch your next session from your watch face PERFECT FOR Tabata, circuit training, CrossFit-style WODs, EMOM blocks, home cardio, and gym sessions where your hands are busy and your phone should stay in the locker. Built for Apple Watch first. Simple on the wrist. Serious about your intervals. Download HIIT and train with your watch, not your phone.