Skeletal muscles not only produce force, they also act as a means for absorbing force, essentially acting as shock absorbers. When skeletal muscles aren’t activating properly, much of this stress is transferred to tendons, ligaments, joints, and surrounding connective tissue.
The feet are no different. With over 100 various muscles, the feet and ankles encompass 15-20% of all the muscles in the body. Read more about barefoot and minimalist training.