Rob Sulaver, CPT, CSCS, founding trainer at Rumble Boxing in New York City, said to keep in mind the strength it requires to do a one-arm push-up. "We use about two-thirds of our bodyweight when doing a push-up from our toes," Sulaver told POPSUGAR. "So the real trick to being able to do a one-arm push-up is to be able to single-arm press at least 66 percent of your bodyweight."
After you're able to press that much weight, your journey toward being able to do a one-arm push-up is that much easier. Sulaver recommends building your upper-body strength with bench pressing on an incline and a decline and flat pressing with a barbell, dumbbells, or a machine. Using cable flies and dumbbell flies will also help, as well as doing push-up variations. "It takes a bit of practice to get the balance right, but with enough strength and a proper setup, a one-arm push-up isn't nearly as intimidating," he said.
