Trial 2 is the Flying Trial. The board and character selection does not really matter for the trial so just pick what you like. Prior to starting the event the game will run you through each task and give you a diagram of how to do each of them. In Trial 2 you need to do the following in a single run:
"Just jump up if you want to catch some air."
"Use a ramp if you want to catch some serious air."
"Spread your arms while in the air to glide." While standing sideways and in mid-air, hold both your arms straight out to the sides.