Trainer's strategy Work one arm at a time for your entire workout to create a balance of strength on both sides of your body.
Why it works Using one-arm training for all exercises prevents your stronger side from compensating for your weaker side, so both arms get a great workout, says trainer Jeff Munger. "When you lift weights, you want to strive for muscular balance," he explains. A symmetrical body not only looks and feels better, but it's important for preventing painful injuries.
The program No matter what your fitness level is, when doing this workout use enough weight to exhaust your triceps (so you can barely do another rep) by the end of each set of reps. Pay strict attention to form; each rep should be smooth and controlled -- 4 counts up and 4 counts down. If you have trouble maintaining your alignment, switch to a lighter weight.