Level: intermediate if you roll half way down. More advanced if you roll all the way down. Keep your chin close to your chest, lengthening your neck.
Targets:core muscles, abdominal and back muscles. Also stretches the back side of your thigh and your back.
Reps and sets: do 2 to 3 sets of 10 repetitions in both sides.
Tips: if you have a sensitive tailbone use pads to cushion the area of your back. If you feel any discomfort in your back do not roll back too much, always avoid lower back pain.