I find the ergonomics of the wheel to be comfortable. The stress on the hands/arms is not painful. The operation of the equipment is smooth and easy to use.
Crunches, planks, sit ups, ab roller, ab rocker, I've done them all. This device is legit and will work you! !. I've had this for a year now and nothing works my abs more.
I absolutely love this wheel. I have been using it for many months now and I use it every day. It tones my core and I can feel and see the ridges of my ab muscles sticking out. It sculpts your arms very nicely also.
He lost his leg to diabetes and need to get some strength back. The OYO unit has been great to help him workout without using going to the gym. I purchased one for my buddy.
Works perfect. I am able to reach my middle back. Some people can not tolerate spikes, but for me it works great to help with back pain.