The same way Arnold built his: isolation. Before he was Mr Olympia, Schwarzenegger cut the legs off his sweat pants and targeted his skinny calves until they looked as buff as his upper body. Do standing and seated calf raises at a slow tempo. “Most guys blow through sets and move too quickly to improve the soleus and gastrocnemius, the two muscles that make your calves look meaty,” says Mike Robertson, a strength and conditioning coach. “Slowing the exercise limits other assisting muscles and places the stress on the muscles in your calves.” Aim for 2 sets of 20 reps of both the seated and standing calf raises 3 times a week.