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For the finger extension exercise, place a thick rubber band around your fingers and thumb near the base of your fingers. With your palm facing the floor,spread your fingers apart as much as possible. Hold
for 3 seconds, then release. Repeat until your fingers and forearm grow tired. After this becomes easy, slide the rubber band closer to your fingertips. When you can readily do the exercise from the fingertips, graduate to a thicker rubber band.