Clark plays Harpsichord and moves his legs

Around 35 seconds in he clearly puts weight on his feet and uses his legs to slide the bench closer. Miraculous healing??

lol

hes been eating babies, gettin the stem cells and all that

I doubt he was putting weight on the feet, someone probably lifted him from behind.

I think he's got a "weekend at bernie's" style scenario going on with his lower body.

possibly employing a system of strings and pulleys.