i said quads because its a great practice place. hard to mess up, you can be sitting down, you can see, you can use both hands.
glutes can get tricky, and you run the risk of hitting your sciatic nerve, and it can be hard to reach so you have to go one handed, etc
glutes can get tricky, and you run the risk of hitting your sciatic nerve, and it can be hard to reach so you have to go one handed, etc