Several years ago I was working out a doctor who described to me the phenomenon of creep. As we get older our physical abilities diminish. Each year we have a little less strength, stamina, flexibility, and ability to withstand trauma and infection.
Slowly the parameters of our world of physical abilities creep in on us. I researched the phenomena of creep and found nothing that was similar to what the doctor described. I think the phenomenon was one the doctor himself coined. Nonetheless, it is very real. We lose a few seconds off our personal records, a few ounce of muscle, and a little range of motion each year. This process will occur more quickly if we are not active. When we exercise we are placing demands on the body that send a message to the body that the muscle, flexibility and stamina are needed for survival. As an act self-protection the body will do what it can do accommodate those demands.