Product is good but the lack of instruction and or video on how to properly size or use reduces the rating

The split ropes are great just wish they were a little heavier. Easy to adjust their length.

I'm giving this four stars only because there is no instruction/video on how to use these. I know it's not rocket science but some kind of instruction as to what length they should be and how to use them to maximize their benefit would be great. Their quality and construction are solid.

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.