This does not address how cats acquire their muscular build. There is no indication that sleep being a physiological need eliminates the need for exercise to build strong muscles.

This does not address the apparent paradox—how cats build such musculature. It introduces a similarity between cats and other animals that extends the paradox beyond the current context but does not resolve it.

This characteristic does not address cats’ apparent ability to build muscle with little exercise. There is no indication that the ability to sleep in uncomfortable positions changes the need for exercise to build muscle.

This introduces a discrepancy between cats and the author’s perception of cats that resolves the paradox. Though the author apparently perceives stretching as purely leisure, stretching is in fact a form of exercise that helps cats build muscle.

This does not address the discrepancy between cats’ activity and their build. There is no indication this requirement changes the effects of a leisurely lifestyle.