**2.1. The importance of electromyography in cyclic exercises**

Cyclic exercises correspond to modalities such as bicycle, running, walking and swimming. Inside those we can already imagine a lot of different sports with a great repercussion over the media, a few examples include: street bike, mountain bike and tour, like the famous Tour of France; marathon, 400 meters, race walking and putting in just one thing, the triathlon. You may notice that the swimming sports are not exemplified above, it's because it is still hard to access the muscle activity through electromyography in those sports due to the environment where they happens. This discussion was set aside for our future work

So, keeping in mind that some of the most important sports have a cyclic dynamic as characterization, for the evolution of them, new technologies need to be able to help the coaches and physical trainers. Nowadays individual time-trial sports are reaching world records that we would never imagine, and every new record is followed by a technology behind it helping in training or even during the task if is not prohibited. To be able to access the muscle activity with a good reliability in different moments of the exercise could give us the weak and the strong moments of one athlete during the task, and allow us to create the better strategy and also create new training cycles that can improve the weakness. It is worth noting the electromyography is useful to access not only muscle activity -- in order to enhance the performance in sports --, but also be deployed in exercises evaluation aiming healthy improvement.
