The folks at Beast have gone several steps beyond tracking rep count by creating a device purpose-built for lifting.
The Beast Sensor— which can be fixed to a body vest for things like pullups or pushups or to a wristband for weight work—is able to measure explosiveness, speed, and power wattage, feed that info to a heat map on your smartphone, then rate your effort. You can further refine those metrics by choosing a specific goal, whether it’s building speed, power, or just size.
It can even warn you about overtraining, sending each rep to your smartphone in real time, allowing you to make adjustments, such as adding reps or weight.
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