When you’re tight on time, this ultimate one-and-done workout will save your a*s. (We mean abs. What were you thinking?) This combination of full-body supermoves hits your muscles from all angles, and it cranks your calorie burn up — way up. « You will define and tone everything, plus you’ll get in your cardio, muscular endurance, core work and balance training, » says your trainer Andrew Speer, a cofounder of Soho Strength Lab in New York City (Christy Turlington is a fan). Nice. The session is split into two circuits: Grab a pair of five- to 12-pound dumbbells and complete Circuit 1 two or three times, taking a 30-second breather between each round. Then do the same for Circuit 2. Finishing with a fist pump is optional.
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