Legs: Physio ball
Ball squats
Start: Feet hip width apart, ball against wall and lower part of back in contact 
with ball, arms extended by side and feet flat
Finish: Squat down to a right angle, keeping back in contact with ball and feet flat, 
don't allow knees to go over toes or heels to raise
Leg curls
Start: Start lying on floor with lower part of legs extended on ball, pelvis elevated
off floor and shoulders and back in contact with floor
 Finish: While keeping pelvis throughout movement elevated, roll ball into butt 
and back out until legs are extended and repeat

