What do barbell curls and dips have in common? A. They are both leg exercises. B. They both use free weights. C. Neither exercise is isotonic. D. They are both arm exercises. Please select the best answer from the choices provided. A B C D

Answer is option "D"

Explanation:

Barbell curls and dips both are arm exercise to decrease the weight of  arm and musclesThis is perform by the flexing of both elbows  and keeping your shoulder bone withdrewDo not allow heavy weight from lower back to arch and push up to about chest levelKeep the spine in zero potential positionDetermine the width of grip and your elbow to ought the potential position of exerciseHence the right answer is option D "they are both arm exercise"

The diaphragm is what i think ur talking about