Inline Skating - Double Push (인라인 스케이트 - 더블 푸쉬 동영상)
Double Push Skating Part1
http://www.youtube.com/watch?v=L8j-be-h0wo
Double Push Skating Part 2
http://www.youtube.com/watch?v=2wj7u0mrP9g
K2/Empire Speed Double Push -
http://www.youtube.com/watch?v=f3-qPSGRLB8
double push
http://www.youtube.com/watch?v=W4eRYQnyHnk
Perfect Double Push
http://www.youtube.com/watch?v=QmFZxNEuJH8
second try: double push
http://www.youtube.com/watch?v=rGE-6RXIeaE