Resilient!

The human musculoskeletal system has evolved, according to one theory, such that our first venture into hominidhood was standing upright.
This freed our hands and set up environmental pressures to use them, which in turn pushed the development of our brains (a significant portion of the sensorimotor cortex is dedicated to the hands).

That upright posture has not been without its costs, however--our battles with back pain and knee arthritis testify to the price we pay.
But in my view it's still worth it!
Be good to your bones and joints today and they will carry you far!