What causes weak thigh, hamstring, and butt muscles in older adults?

As we grow older, we typically look for more energy-efficient ways to do things. Our leg muscles seem to get tired more quickly. One of the easiest things to do to conserve strength and stave off fatigue is to straighten, or "lock," our knees while standing.

Doing so allows us to stand on our joints (which possibly contributes to arthritis) instead of using our muscles to hold us up. When we lock our knees to stand, the thigh, hamstring, and gluteal (butt) muscles don't need to turn on. Do this often enough and they forget how to turn on.

Pretty soon we even develop the ability to walk or run while keeping these muscles, usually the gluteals, turned off.

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