Stand upright and grab a pair of dumbbells with your arms extended at your sides (Palms facing in).
2. Flex your shoulders to raise your arms to shoulder height, hold the contraction for a moment and slowly lower your arms but do not return to the starting position.
3. Once the dumbbells have reached hip height, raise them back up.
4. Keep raising and lowering the dumbbells in the top half of the full R.O.M (range of motion) until fatique.