Abs Decoder will work your abs, glutes, quads and calves. It will help make your front hip flexors stronger and also work your side hip flexors. It won't push you to the edge of your abilities but then again you don't need to go there every day to get a good workout done. You can make it a tad harder by accepting the Extra Credit (EC) and reducing rest time between sets which then also begins to test your endurance, but in a good way.