A team of former Tesla engineers are working on a fitness tracker specifically designed to help you gain muscle at the gym.

The Fort wearable is from a San Francisco-based startup. It is a screenless band that promises to detect reps, sets, and rest periods, saving you the trouble of manually logging your workouts and pilates sessions, reports New Atlas.

After every workout, details such as session scores, per-muscle volume breakdowns, proximity to failure, time under strain, rep velocity, rest periods, and rep cadence will be displayed on its companion app. Additionally, it will show you form-related feedback such as range of motion and velocity loss.

That goes far beyond what you get from the majority of other wearables, which monitor your heart rate and aerobic capacity but are unable to provide information on your level of muscle weariness or effort.

Fort tracks your activity during a workout using an Inertial Measurement Unit (IMU) that has a PPG heart rate sensor, an accelerometer, and a gyroscope. It detects the exercise you're performing by taking a high-frequency sample of your wrist movement. It then tracks your repetitions, verifies your form, and assesses your training intensity.

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The Fort's charging base may be used as an external motion sensor while you work out your legs by attaching it to a leg press or cable stack using a built-in magnet. This enables you to monitor sets and repetitions for a variety of lower-body exercises.

Fort claims it covers more than 50 additional exercises in addition to all the regular cardiac training it monitors.

Fort monitors sleep stages, stress, heart rate zones, VO2 max, recovery scores, nightly HRV, and all-day activity, just like other fitness wearables. According to the manufacturer, a fully charged built-in battery should last you seven whole days.

That could make for a compelling investment for people serious about developing muscle and functional strength across age brackets.

The Fort is expected to retail for US$319, and you'll also need to pay an annual subscription fee of $80 for the app, making it somewhat expensive even before it launches. Pre-orders are currently being accepted by the company for $289 each, which includes a year's subscription, making it somewhat more affordable. The initial set of pre-orders is anticipated to ship in the third quarter of this year, and it is available in Silver, Black, or Gold with a variety of strap options.