I'm being realistic here by giving it 2 stars. Why 2 and not 1? Well, because you CAN jump rope with it, and do double unders but it's hard to get good, solid, _consistent_ results. Here's why the rope fails: most importantly the bearings are complete crap. Ever remember getting a skateboard and spinning the wheels to see how long they spin on their own? That's a good test to see what condition the bearings are in. I've had this rope for maybe 4 months and it doesn't spin 1 revolution why I try it. Second, the speed rope is way to light for such crappy bearings. Maybe if the bearings worked the light weight would be fine, but since the bearings suck you don't get even revolutions. Thus your timing isn't 100% consistent. Basic single unders (aka jumping rope like a 3rd grader) can be a pain in the butt too since it also gets effected. Last, the "adjustment" part does make the rope adjustable but it compounds the crap bearing problem because it creates these floppy "ears" that make revolutions even more inconsistent. That said, I am buying a new rope (for those wondering who makes good ropes, check: rxsmartgear dot com, jumpnrope dot com, rpmrope dot com, or cyclonespeedrope dot com) from a different company.