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Hold a bottle of shampoo in your hands. Raise your arms above your head, arms alongside your head, and lower the bottle behind your head so your elbows point to the ceiling. Slowly extend your arms straight up above your head and slowly bring them back down. Repeat this exercise for at least 2 sets of 12 reps. Focus your attention on your tricep muscle (back of your upper arm) and create your own resistance. Keep the movements slow and controlled. Keep your core engaged throughout this exercise.
Variation: Perform exercise using one arm at a time.