If you want to see rippling abs when you look in the mirror, you have to do two things: Melt fat and train your core. Most people take this to mean "do some form of cardio and follow it with an abs circuit" -- but that's a big fat waste of time.
The rotational mountain climber jams cardio and abs together in one flab-torching, heart-rate-rocketing six-pack sculpter. "Using nontraditional cardio exercises like this one are the key to really challenge your body and get your metabolism up," says weight loss expert Rachel Cosgrove, creator of the all-new Spartacus 5.0 Workout. "The rotational component puts an extra demand on your core."
Best of all, you can do them anywhere -- no weights required.
Ready to set your abs and lungs on fire? Watch the video below to see how to do rotational mountain climbers.
One word of caution: As you get tired, your hips will start to rise up into the air. Fight against it. (Doing these in front of a mirror helps.) "The entire set of this exercise, keep your hips down, in line with your back and shoulders," Cosgrove says.