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You can do this seated or standing. Keep your back nice and flat. Bend your elbows up and out, keeping your arms nice and straight with your elbows close into your body.
Keep your wrists open, starting down around your thighs. Keep your wrists facing the front of you, meeting at the top, and coming down to the bottom. You can do this seated or standing with a light weight, no weights or whatever you would prefer.