Here’s a couple of my favorite weight loss workouts.
These lift your butt exercises really work.
I’ve put together a bit of info from my personal research:
First up here’s a great infographic on 7 exercises for instant butt lift. I tried them
Pushups work your upper body. Specifically your chest, lats, shoulders, and triceps.
It depends on which muscles you focus on and how strong they are. Generally you use the muscles that you are most comfortable