At the bottom of the pushup, you want to strive to have your elbows stacked directly over the wrists. Different limb lengths and body types can make it difficult to attain this position, and it doesnt have to be a perfect right angle but the more you can *strive* to stack your elbows over your wrists and create a vertical forearm, the more force youll be able to put down into the ground, and the stronger your pushup will be.
