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Jun 6, 2022Best Leg and Arm Machines at the Gym Shape Know More. Apr 16, 2019 0183 32 Since leg and arm machines at the gym are inherently stable and have one or a few, at most fixed motions, you re also not using supporting muscles to keep your body and the weight stable, adds trainer Laura Arndt, CSCS, CEO of Matriarc, a pre and postnatal fitness appFor example, doing a standing biceps curl will ...