Looking to squeeze in a quick workout on a busy Monday? When I'm in a crunch, one of my favorite timesaving tricks is to focus on exercising the big muscle groups (chest, back, butt, and legs) in my body. Working the large muscles is a fabulous way to boost your metabolism since the bigger the muscle, the more muscle fibers activated, and therefore the more calories burned. Bingo! A few of my go-to exercises on days when I am short on time are squats, chest presses, lunges, back extensions, and planks. Try it out the next time you're not able to fit in a full workout.