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Poor alignment or overuse of your wrist can lead to tendonitis or other wrist injuries.
The best position of the wrist for biceps curls is to keep your wrist joint “neutral” and kept from moving. Do not curl the wrist at the top.
The best position of the wrist for bench presses is to fully grasp the bar using all fingers, even your thumb. Rest the bar on the lower meaty part of your palm, ensure that your wrists and elbows stay in alignment. Keep the wrists in a neutral position rather than hyperextended back. The wrist joint should remain in the neutral position and kept from moving.