Seven days of battery life, even while tracking every rep, set, and rest period in your strength workouts — that’s what Fort, a new wearable built by former Tesla engineers, is promising.  

Fort’s band promises [7 days] of battery while tracking every rep. Credit: New Atlas  


The device is a screenless band designed specifically for strength training, a category most mainstream fitness trackers barely touch. Instead of just logging heart rate or calories burned, Fort uses an Inertial Measurement Unit — a combination of accelerometer and gyroscope — along with a PPG heart rate sensor to capture wrist movement at high frequency. That data allows it to recognize the exercise you’re performing, count reps and sets, and even evaluate your form by measuring range of motion, rep velocity, and cadence. For lower-body exercises, the charging base doubles as an external motion sensor, attaching magnetically to equipment like a leg press or cable stack to track movements that wrist sensors alone can’t capture.

[50 exercises] tracked without a screen, but with precision. Credit: New Atlas


The companion app is where the detail comes alive. After each workout, it delivers a breakdown of per-muscle training volume, proximity to failure, time under tension, and rest times. These are metrics strength athletes often track manually, but Fort automates the process. It also provides feedback on velocity loss — a key indicator of fatigue — and scores each session to help users understand not just what they did, but how effectively they trained. In total, Fort claims to cover more than 50 different exercises, spanning both strength and cardio.

Tesla engineers turn their focus from cars to muscle fatigue. Credit: New Atlas  



This level of granularity sets Fort apart from conventional wearables. Most trackers focus on aerobic metrics like VO2 max, heart rate zones, or recovery scores. Fort includes those too, but its core value lies in quantifying muscular effort. By measuring rep speed and tension, it can highlight whether you’re lifting with enough intensity to stimulate growth, or whether fatigue is compromising your form. That’s a significant step forward for anyone serious about building muscle, since strength training progress depends on precise load management rather than just duration or calories burned.

“Redefine strength,” says Fort’s team, as the band counts velocity loss. Credit: New Atlas  


Battery performance is another deliberate design choice. Fort promises a full week of use per charge, even with continuous tracking. That’s competitive with mainstream devices, but notable given the higher sampling rates required for strength metrics. The band itself comes in Silver, Black, or Gold, with interchangeable straps, and is priced at US$319. The app requires an annual subscription of US$80, though pre-orders are currently discounted to US$289 with the first year included. Shipments are expected to begin in the third quarter of 2026.



The company’s founders emphasize that strength training isn’t just about aesthetics. Research increasingly shows it improves longevity, reduces injury risk, and supports functional health across age groups. A tracker that removes the friction of manual logging could make adherence easier, while also giving athletes and everyday users alike a clearer picture of their progress. As one of the engineers behind Fort put it in the launch video, the goal is to “redefine strength” by making advanced training insights accessible without the need for lab equipment or spreadsheets.

What Fort represents is a shift in how wearables approach fitness. Instead of treating strength training as an afterthought, it builds the entire product around it. If it delivers on its promises, it could mark the beginning of a new category of trackers — ones that don’t just monitor your body, but actively help you train smarter. The question now is whether athletes and everyday gym-goers will embrace a device that asks them to trust algorithms with their progress. If they do, the future of wearables may look less like a watch and more like a coach on your wrist.


Sources: New Atlas; Fort