You want your hams and quads to be symmetrical and balanced, not to mention able to stabilize your joints and absorb the forces of a solid leg workout. You can test that balance with single-leg hops, says Australian and New Zealand researchers in the July 2009 issue of The Journal of Strength and Conditioning Research. To do it, place a yardstick on the floor. Stand on your right leg at one end of the stick and bound toward the other end. repeat the action with the left leg. Do the test three times and compare your best hops with the table below. One side will probably perform better than the other, but there shouldn’t be more than a 10 percent difference between legs.