That's right—we're talking about the torso rotation machine. This is the Chubby Checker–inspired ab machine you sit in to do ...

Amp up your core strength circuit with cable crunches, wood choppers, and Pallof presses to hit your abs from every angle. Do 4 sets of 15 reps each with moderate weight, then finish it all off with ...

An curved arrow pointing right. Cristiano Ronaldo stars in a bizarre ad for his Japanese ab machine, Training Gear Six Pad. The machine promises to get you ripped without even lifting a finger by ...