Has your regular workout routine become too routine? Time to kick-it-up a notch and see more results with these muscle-shocking moves from Supreme 90 Day System. One key to their calorie-blasting success is muscle confusion. We asked Michele Collier and John Dull, the creators of the tough workout to tell us more about what it is and why it works.

****"The biggest problem people run up against when starting an exercise program is everyone sees results at first because the body isn't used to the demands you are putting it through. When the body adapts and gets used to the workload, results start to diminish. It's at that point that you need to change things up to continue getting results. Supreme 90 Day utilizes the science of muscle confusion to do that. Workouts as well as the body parts that are trained are changed on a daily basis through the entire program keeping the body on its toes," say Collier and Dull. ** **

***The Workout: Do as many reps as you can, as fast as you can, for 30 seconds. Rest for 30 seconds in between each move. Repeat the circuit up to 3x.


](http://blog.self.com/fitness/blogs/freshfitnesstips/assets_c/2011/04/bear%20crawl%201-104684.html)The Move: Bear crawls*

**Target: Total body toning with emphasis on triceps, shoulders, upper back, core, glutes, hamstrings, and calves

**You'll Need: space to travel on the floor

***How to Do It: are performed on all your hands and feet in a bear-like position. You begin by extending your right hand and foot forward followed by the left hand and foot forward. Crawl forwards for 3 counts (right, left, right) then backwards for 3 and repeat for time.