To understand the format of big air and rail jam contests.
There are a number of different formats for this, but all of them are about demonstrating progression.
There are no set age divisions for these events. Most will have a junior division of some sort.
Most big air events provide the athletes with a set number of hits, typically two or three. Scores for each hit are out of 100, with the best score counting.
Some big air events use more of a progression format, where the athletes are given as any as five hits. Here, the top two or three scores may be used to average between to create a final score out of 100. The other two or three runs would be discounted.
In a jam session format, riders are given a specified time period in which they can take as many runs as they choose to (depending on the starter and keeping the course safe).
Athletes are given an overall performance score for the whole jam session, meaning the more variety of tricks, and consistency in landings, the better. Scores are out of 100.
In most big air and rail jam contests, riders are judged on; progression, amplitude, variety, execution and difficulty.