Actually I think in the right context extensions can help add size to the quads to some extent BUT the reason I used them for a comparison is because people tend to rely on isolations to "isolate" which makes sense, lol, but there are much better ways which can allow you to use MUCH higher intensity to get at certain parts of the leg WHILE actually helping you along the road to bigger strength gains. This while helping to keep your knees healthy.

Leg extensions, believe it or not, won't help you squat very much. I.E. they mostly make you better at extensions. For that very reason I would personally reccomend against using them for warm-up to the squat. I would stick to squatting to warm up for the squat. The neural recuitment is different. And what about the hams, glutes, and all the rest?

Leg extensions will warm up the quads, but a good warmup not only warms up the muscles it gets you ready for the heavier weights and if done optimally will result in heavier loads. Since extensions only help warm the quads but you really need light squats for a proper warmup (which will of course serve to warm you up) all you're really doing is introducing unnecessary fatigue with the extensions, if anything.

I'm a big fan of single leg exercise and they have just a huge number of benefits. Obviously they are not a mainstay and in the end the main way to get huge wheels and a huge squat is to squat. But what I like about many of the single leg variations is that you CAN make a habit of them and stay healthy. While, for instance, putting blocks under your heels during squats to get at the quads is something that, while effective, is not something your knees will love you for in the long run (to give an example).

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.