What’s your pump up song?“Flight Simulator”Unbroken Double Unders5-10-15-20-25-30-35-40-45-50-45-40-35-30-25-20-15-10-5"Chillaxing your way to double unders" - by Lisbeth DarshUsing the Speed Balls - VIDEOAnother good instructional video - Double Unders[youtube=http://www.youtube.com/watch?v=h7XjUbUpeHE]
