“I’d give it no stars if I could” only served to pique our curiosity. Our Japanese-language reporter and Amazon product reviewer Masanuki Sunakoma has been doing a lot of traveling and eating out lately, so he’s been thinking it’s time to work off all those extra calories. After some browsing through the countless varieties of workout products on Amazon, he stumbled upon something called the “New Model Ab Roller”. The New Model Ab Roller’s full name is actually the “New Model Ab Roller Automatic Rebound-style Ab Roller Ab Machine Muscle Training Abdominal Comes with a Knee Mat, Elbow Supports, Timer,…