Tendon pain from too much use is a very common problem in sports activity. It occurs if the cumulative load on the tendon is higher than what the tendon can take. There is two parts to this: the first will be the cumulative load which means just how much activity is carried out and how frequently this is done. It is important that the tendon is given time to get used to those loads or the cumulative load may go beyond that. That's the second part, just how adapted the tendon would be to those loads. Being familiar with these principles is very important in understanding and treating tendonitis.
For example, peroneal tendonitis which is an excessive use injury occurring on the outside of the ankle joint. The collective load in this tendon is higher when activity amounts are too high or increased too quickly and not sufficient time is given for the tendon to adapt to those high loads. The cumulative load can also be increased by the biomechanics of the feet. For instance, if the supination resistance of the foot is lower then the peroneal muscles on the outside of the leg will have to work harder. That will place an greater load on the peroneal tendons after which coupled with training errors that load could possibly exceed what the tendon can take and it develops tendonitis.
Based upon these concepts, peroneal tendonitis is treated by reduction of that collective load. That could mean exercising amounts and frequency has to be decreased somewhat to permit the tendon to adapt to the loads. The strain in this condition can also be decreased with foot orthotics that evert the foot, which means the peroneal muscles does not need to work so hard. Next the tendon really should be given an opportunity to get used to the loads. This implies that training volume and frequency has to be slowing increased, with plenty of rest between training loads to get the tendon to adjust to those loads.