Get in touch with your wild side at Equinox's new Animal Flow class where you burn calories with freestyle cheetah-like movements. Moving like a pack, you learn primal body movements that tone the body during this high-energy 60-minute workout. The group classes officially launch in January, but you can get a head start with personal training instruction now. Equinox's celebrity clients include Cameron Diaz, Mila Kunis, Will Smith and Mark Walhberg.