When we look at the biomechanics of running in triathletes and marathoners, there are different body loads compared to walking and sprinter (speed) runners, which are a normal activity. We all know external factors (floor, slope, etc.) and material factors such as shoe selection. However, the most important part in running biomechanics is that the knee-hip-pelvis-head-spine-arms are affected as a chain, starting from the contact of the foot with the ground. The reverse is also possible. Any small angle change from top to bottom affects running technique, loads on all joints and running performance. This is also associated with injuries.