Bikram alone can't provide the perfect workout—and neither can running, cycling, swimming or any other activity you do exclusively. In his book 20 Years Younger
, Bob Greene found that the people in the absolute best shape were those who switched between three to five different exercises each week. That's the optimum way to work as many muscles as possible and avoid injuries from overuse, he says.
Read more: Bob Greene reveals the other ways you may be sabotaging your workouts