Photo: Courtesy of A.C.E.
If you have 20 minutes...break a sweat with this HIIT workout.
Hot new research that shows that high-intensity interval training (HIIT) can boost muscular and cardiovascular fitness as effectively as steady-state cardio—n half the time. This circuit routine
was created for Oprah.com by Jessica Matthews
, an exercise physiologist for the American Council on Exercise (ACE), and each move involves multiple body parts, adding up to a legitimately challenging workout that even gym bunnies will take seriously.