Knee extensions: Straightening and bending the knee joint will help retain some muscle mass tone in the quadriceps, which happen to be crucial for supporting the hip joint. A great deal of data suggests that vitamin D regulates skeletal muscle mass physiology. On this level, this concept generally originated from https://www.theorthopaedicandpainpractice.com/i-have-a-broken-bone-what-should-i-do/