A technology that counts reps and scores muscle failure from the Apple Watch

By baraa_bilal · 2026-08-24 · 2 points · 0 comments

Hi HN, I built this. Riven turns Apple Watch motion into three things: when a set starts and ends, which exercise you're doing, how many reps you did, and how close that muscle got to failure. The only sensor it uses is the Watch's 100 Hz motion sensor. No manual input at all. S…

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