A
Amaris
Guest
Slow going down (bringing my chest all the way to the floor), fast pushing back up, and I make sure I squeeze my chest and triceps at the top. Now, keep in mind, if I'm doing push-ups, I will do 4-5 sets of 20-25, with my hands at various widths (or sometimes I will do them with dumbbells in my hand, so I'm elevated and can go even deeper).
This explains why you have muscles and I have pain.

