We’ve all seen it: the guy doing biceps curls with his hips and lower back instead of his arms. Sure, challenging yourself with big weights every now and again can be helpful, but consistently choosing weight that’s so heavy you have to swing it isn’t going to get you much stronger.
“The key to a good arms workout is keeping your elbows at your sides,” says Ashley Hoffmann. “Use only your biceps or triceps to do the exercises, not your body’s momentum to move the weight.” Whether you’re doing curls or extensions, keep your elbows pinned to the side of your body, which will stop you from using body English to move the load.
In order for your biceps and triceps to grow, you need to make sure that they’re the muscles being stressed. If you use your body to move the weight, you take away from the workload your arms could be doing, which could mean less change in the target muscle group.