Adding a power move to the end of a leg workout is great way to boost testosterone concentrations in an effort to improve muscle size. Sports scientists at AUT University in New Zealand put a group of athletes through several different squat protocols and then measured the post-workout testosterone levels of their saliva. They found that a combination of low-rep heavy-load squats (three-rep max) followed by three sets of three explosive jump squats, using 50 percent of their one-rep maximum, provided the greatest enhancement in the anabolic hormones that lead to muscle gain. Adding power exercises (explosive movements in which the load is moved quickly) is also a great way to stimulate type II muscle fibers, which have high potential for growth.
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