This is the Force Tracker: a smart punch tracker that gives you 360-degree analysis when you strike. It can be easily attached to the bottom of your heavy bags for tracking. The xForce Tracker app stores your 10 latest results. It is available for iOS devices.
More gadgets like this: here
The Force Tracker calculates your striking power, speed, and endurance. It has an instant feedback and global ranking system to keep you motivated.
[where to get it] [official site]
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