Originally Posted by nateteachski
What would be the test of strongest quads? Just wondering if I could take it.
I would say the squat for the truest test of general leg strength.
Most can push far more weight on a leg press which requires no balancing or stabilizing - just pushing, and I find that it equally engages the glutes/hams. See for yourself. Load up a sled and see how many reps you an do, and try the same weight with a bar on your back in a cage. It will be the difference between doing bench presses in a Smith machine and with flat bar.
As a practical matter,I think it is difficult to truly isolate the quads so completely that the glutes and hams are not engaged. Only machine I can think of would be the seated quad extension, which I do not like, as I much prefer to hit as much of the entire leg musculature as possible when doing legs in order to preserve symmetrical development.