Core Master - 360° Dynamic Core Trainer

There are lots of fancy fitness gadgets that are ineffective, but this one is great. Just maintaining your balance in the plank position is very challenging. What’s the big difference between this and an ab roller or rolling on a ball? Your upper body’s center of gravity is much lower, which makes it much harder. Why isn’t a balance board enough? Because you can’t roll on it. Give it a try

Great product and quality

Everything, I didn't experience any flaws