Supine foam roller balance, alternating arm lifts

Lie on top of a foam roller so that your pelvis, spine and head are supported.
Bend your knees, place your feet flat on the floor and rest your arms by your sides, palm side down.
Lift one arm up and overhead as far as able.
Bring your arm back to the start position.
Lift your other arm overhead as far as able.
Bring your arm back to the start position.
Repeat.