Very impressive vertical leap here from Frank Yang, with an offical 40″ vertical leap recorded electronically in a gym. Check out the video below-

Mad hops from a Springsole user!

Check out this guy, pulling 540 spin dunks from a stand still. He swears by Springsoles, so why not check them out today? - http://springsoles.co.uk

These kids got these leaps after 6 weeks of training apparently. They mention a couple of guides and also Springbak Springsoles. You can check those out here - http://springsoles.co.uk