Fort Wristband Tracks Bar Speed and RIR Without a Screen

A group of ex-Tesla engineers has built Fort, a screenless wristband that claims to track bar velocity, reps in reserve, and proximity to failure automatically from your wrist during strength training. That is a direct shot at a gap Whoop has never fully closed, despite years of recovery-focused marketing and a $30/month subscription model.

Bar speed tracking normally requires dedicated hardware like a GymAware or PUSH band, devices that clip to the barbell and cost upward of $300. If Fort can deliver reliable velocity-based training data from a wrist sensor alone, that changes the value proposition significantly for hybrid athletes doing both lifting and cardio.

The screenless form factor puts it squarely in Whoop territory, not Garmin or Coros. You get no on-wrist feedback, which means you live in the app. Whoop 4.0 went that route and polarized users. Fort needs its passive tracking to be accurate enough that the lack of a display feels like a feature, not a compromise.

RIR estimation from a wrist sensor is the real technical claim worth scrutinizing. Polar and Garmin have struggled to make rep counting reliable even with optical sensors, and neither attempts failure proximity. The hardware pedigree from Tesla is interesting, but wrist-based force inference is a different engineering problem than battery systems or autopilot.

Verdict: Promising concept, unproven execution. Worth watching if you train heavy and want recovery context alongside velocity data. Wait for independent testing before subscribing.