The backside boardslide (often shortened to just a ‘boardslide’) is the next step. Sliding down a rail with your board lengthways is fairly easy as the main focus is on keeping straight. With the boardslide however, you need to turn 90 degrees off the lip and land with your weight evenly balanced so as to not catch your edges: no mean feat. As with many rail tricks, the key is to visualise yourself doing it first - fully committed - then to really go for it. And it’s probably a good idea to wear some good bum padding when you start out too...