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
Welcome to, Jump higher, Run faster! The only blog online that gives you the best tips, guides, exercises and products to get you in the air and upto speed. Get that 100m PB and improve your vertical leap right here.