With her provocative essay The Final Nail in the Cardio Coffin, Rachel Cosgrove, co-owner of Results Fitness in Santa Clarita, Calif. gave women everywhere the permission (or push) to give up mindless treadmill runs and hit the weights—hard. She has since carried on the momentum of her less-is-more message in The Female Body Breakthrough and the soon-to-be-released Drop Two Sizes. Rather than focus on celebrity bodies, Cosgrove gears her workouts toward helping real women overcome their most common obstacles. She even uses real clients as examples in her books and videos.
Why you'll love her: "Pistol squats are killer. Try this trick to work up to one: http://ow.ly/gkaSS" How fierce will you feel when you can do one of these in the gym?