She has been practicing since 2004. She said this in an interview.
Pilates
It is very useful for dancers as it increases flexibility & core strength.
Bicycle Crunches
It is one of her go-to moves. As per her trainer she always aims to sixty sets of 20 reps
Recovery Routine
She follows a strict ritual to help her body rebound. Ice bath for 5-10 mins hot bath for 20 min then compression suit packed with ice packs for 20 mins.
Horse Riding
Lady GAGA loves Horse riding. You can see her pictures on instagram..