Exercise geared towards women with no ass, to increase the size, or one with an out-of-shape ass, to tighten it up.
Her ass is drooping bigtime; she needs some assercise.
My ass is totally flat, but look at her! Could I get an ass like that if I did some assercise?
He is so bony. Dude could use some assercise.
A form of exercise especially geared towards women with big butts.
Geez, her butt is huge. She can really use some assercise.