See, this is the point where you should look at this and say "I don't know enough about physics and human physiology to make a statement about this". Instead, you went with "bro, do they even lift?" Congrats. You made an idiot of yourself on the internet.

Ok, Mr. Physics. Absorbing a load though the joints and the compression of the muscles and the geometry of the knee and ankle bending has nothing to do with the extension power of the muscles.