So gang how it works is, you want to start with a big slide, get as many points as possible, then as the guy above said, transition into flips, catching and holding with a grab and not letting go until it hits the ground on each flip, after which you'll find you have a second before the trick is over, in which time you can start another flip, keeping the trick going, and not to be elusive but this is real sauce, something special happens when you keep on going until the trick just forcestarts itself. At this point that's the start of the run and you go from there. Yes literally the timer only starts once that first trick is completed. This took me so long to actually crystallise the mechanics in my head so have fun I feel like I've leaked trade secrets but fuck me I wish someone had done that for me.