Great product

For years I had been trying to get consistent double unders and could not figure out how. When I finally started to consistently use these trainers I overcame the imbalanced wrist rotation-ability of my left wrist compared to my right wrist and built up the forearm strength to be ready to finally string sets of double unders together consistently. I started with single rotations only (no jumping), nice and slow, and built to big unbroken sets of 500+ spins. Then added speed and rebuilt to 500+ spins and reparares the process until I was spinning fast enough to try double spins. When I got to 100+ unbroken double spins, I started adding jumps. When I could do 100+ double spin jumps, I transferred to the jump rope and my dubs were revolutionized.

This tool really does help with wrist strength and technique. a certainly allowed me to train following an ankle strain.

These trainers are awesome. They have helped our members who were struggling with double unders but they have also helped members who were just learning to jump rope. A must have for all boxes!