EBOOST FitTip™ Friday: Workout Your Larger Muscles: Crunch This! Did you know it would take approximately 250,000 crunches to burn just 1 pound of fat? If you are aiming to chisel your gut, implement a healthy meal plan and focus on training the larger muscles of your body, targeting your hamstring, glutes and quadriceps. Not only do they require a lot of energy to move, but cause high levels of caloric expenditure post workout.