A linear encoder is composed of an optical encoder capable of measuring angular movements and a coil that allows linearizing them, in this way, any linear movement can be measured. It is a very useful tool when it comes to evaluating the work an athlete does in the gym. Thanks to different variables measured by the device (displacement, velocity, acceleration, power …) it’s possible to know with high precision the fitness condition of an athlete daily and without the added fatigue. In this way, among many other things, you can know how much weight your athlete must train every day to get the maximum match to the lifting session. You can also find and control the fatigue that the athlete accumulates, avoiding possible injuries in their specific sport.