BACKSIDE 5-0 GRIND [SKATEBOARDING BOX TUTORIAL #4.0] 

This movie explains BACKSIDE (B/S) 5-0(five-o) GRIND in skateboarding with understandable 3D image and graphics B/S5-0 GRIND is the skateboarding trick grinding on the ledge with back truck while front truck is above coping. Ledge is at your back side.
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