18-Minute Fitness Routine

This program, All in 18, embodies that very concept, delivering snappy workouts that are proven to torch fat and sculpt head-to-toe hotness in that magic-number time frame. The sessions are zippy for jam-packed schedules, require minimal at-home equipment (a mini band and some dumbbells), and are scalable to every fitness level. And they target the areas we struggle with most: thighs, middle, butt, and back of the arms.
The science doesn't lie: Studies show that elastic bands increase muscle activation by about 20 percent, especially in the glutes (the biggest calorie-burning machine in your bod, FYI), so each rep is truly maximized. And those high-intensity resistance intervals? Fresh research from North Dakota State University suggests they may torch twice as many cals as previously thought - more like 26 per minute. Make no mistake, though, these workouts are tough. But this program will make you want to push yourself for her.
Combining five of her favorite moves from All in 18. Two or three times a week, perform each move in order, with little to no rest in between; repeat the routine up to three times total, resting 30 seconds between rounds. To kick your metabolism into serious overdrive, complete the two-part finisher. In just six weeks, you'll be ready to reveal a more slammin' you.