Boxing
Olympic athletes aren't the only fans of this intense workout. Models have been thanking boxing gyms across New York for their unreal bods for years. Get Gigi's abs at Gotham Gym. Meanwhile, Ringside Café lets you fuel up after an intense cardio class at Shadowbox.
Gotham Gym, 600 Washington St.
Shadowbox, 28 W. 20th St.
[Photo via @katiecorc]