Life is hectic. Staying in shape shouldn't be. So isn't it nice that relaxing your mind and working your booty can go hand in hand? A trendsetter in the genre that hit mainstream gyms a few years back, Exhale Mind Body Spa (28 Arlington Street, Boston, 617.532.7095) has maintained its core-fusion cult following, while the recent $7 million renovations at the Sports Club/LA (4 Avery Street, Boston, 617.375.8200) included an impressive 9000 square feet of mind/body studios. Boston's latest fitness darling, Equinox (131 Dartmouth Street, 617-578-8918), promises to help you sweat it out and ease your mind with Power Flow Yoga, "a dynamic, physically and spiritually energizing form of yoga that sculpts every muscle in the body." We feel better already.