I love a yoga block; it can make an exercise more challenging (try putting a block between your thighs during chair pose) or ...
As WH’s Fitness Director and a regular strength trainer, squats are now second nature. I *think* I’ve nailed my form, and from squats with weights to bodyweight squats, I’ve tried a load of variations ...
Use the stability of an anchored barbell to help you put more of your effort into building your quads ...