In Part 5 of our skateboarding DIY video series, "From the Ground Up," Al Partanen builds a cinder block extension on an existing cement bank. SUBSCRIBE ► http://xgam.es/YouTube X Games has been spreading the shred in action sports since 1995. For more coverage and highlights visit our official homepage at http://xgames.com --------- Twitter ► https://twitter.com/xgames Facebook ► https://www.facebook.com/XGames Instagram ► https://instagram.com/xgames --------- Thanks for watching X Games!