Ab rollers are one of easiest and cheapest ways to work out your aps at homeorkout The traditional roller can be hard tor a beginner because it takes a lot of stability, and it also puts stress on your shoulders and arms as you try to hold the wheel out. This machine makes the movement more like a rolling plank and it keeps all the focus on your core. It has a slight outward retraction that will push you back out for your next set. It also has a countdown timer so you can track your sets, and a phone mount if you want to distract yourself during the workout. The included knee pad makes it a lot more comfortable to use on the floor.