Hold a small ball in the hand to be worked, lean forward and put the ball onto your lower leg just above the ankle. Use only your fingers to slowly walk the ball up your leg all the way across your body to the opposite shoulder. Reverse the exercise walking the ball all the way back down to your lower leg, the starting point. This completes one repetition.
Repeat for the number of sets and reps indicated by your clinician.
You can do this with smaller soft balls to increase the difficulty. Moving slowly and controlled is much better than rushing through this exercise.