Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dud!

You don't need a rebounder for this one. But you do need strong knees. It's mostly squats & squat-jumps on or off the rebounder. Then some very repetitive floor work. He stops constantly to 'check-out' his crew, complains about sweating, and has a very noisy crew member. Boring, dull, and rebounder-less!