WHAT IT IS: A total-body workout that relieves stress and increases self-esteem. “I just started doing more kickboxing which is really fun, and the way [my trainer] does it it’s like a full body workout. Like squat, lunge, squat, lunge, or lower punches. It’s really like a full body workout.” Lauren Conrad, on Fitsugar.com
WHAT IT IS: The meditative practice strengthens muscles, increases flexibility and improves posture. Spotted? Lady Gaga, Jennifer Aniston and Alessandra Ambrosio. “I do yoga, yoga is very important. I love it. If I’m not doing it, then my spirit sort of goes. I try to do some form of exercise, even if it’s just for 20 minutes a day, so that I get my body sweating and blood pumping.” Jennifer Aniston, to Female First
Countless celebs grab their girlfriends and hit the track. Spotted? Katie Holmes, Fergie and Reese Witherspoon. “I try to exercise every day. I like to run for about an hour, and I’m big into working out with girlfriends.” Reese Witherspoon, to InStyle Magazine
WHAT IT IS: Pilates promises to build core strength and develop dancer-like muscles. Spotted? Ellen Pompeo, Jennifer Garner, Jamie Lee Curtis and Jennifer Lopez. "From breathing techniques and muscle toning to overall flexibility and relaxation, my Pilates sessions have become something of a weekly necessity that keeps me fit, happy and energized." Pippa Middleton, to Parsons Green Pilates Studio
WHAT IT IS: Time flies when the music blasts. Spin class is a low-impact workout that brings maximum results. Spotted? Julia Roberts, Hilary Swank and Kelly Ripa. “Thank you @soulcycle and superstar Melanie for the awesome Eminem spin! #Cinderellaman” Kelly Ripa (@KellyRipa) via Twitter
WHAT IT IS: This military-inspired workout encourages users to push themselves to the next level. “I’m kind of loving Barry’s Bootcamp. It’s Torture but it’s amazing. I see a difference right way when I go.” Kim Kardashian, to People Magazine
WHAT IT IS: The combination of ballet and aerobics increases flexibility and builds long, lean muscles. Spotted? Kelly Osbourne, Eliza Dushku and Drew Barrymore. “It just knocks your butt off.” Drew Barrymore, to People Magazine
WHAT IT IS: A simple way to get in shape and catch up with friends. Spotted? Katy Perry, Zooey Deschanel, Heidi Klum and Tinsey Korey. “I really mix it up … Sometimes it’s even just a walk. It’s about being active.” Zooey Deschanel, to Health.com
Shaun T.’s 60-day fitness DVD takes interval training to a new level. “Just did the #Insanity workout DVD… Amazing.. So intense but I loved it!!!” Demi Lovato (@ddlovato) via Twitter
WHAT IT IS: This fusion of Latin dance and group fitness is a high-energy workout for all ages. Spotted? Jordin Sparks, Madonna, Vivica A. Fox and Jennifer Lopez. “You’ve gotta do things that make you happy … join a Zumba class … whatever, you’ve just got to do it.” Jennifer Lopez, to Redbook
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