A B/S Boardslide is easy once you get you balance(Try a B/S Noseslide to help you get the slide balance down.)
Josh Thompson
1. Roll up to a rail or something you want to Boardslide
2. Pop a ollie and spin 90º
3. Land on the rail with you board centered.
4. Slide till the end of the rail
5. spin a 90º turn to roll out fakie or regular. | 
