Snowboard Help! Im Having trouble Spining 360 In the Air?

Come into the jump with a lot of speed and be on your edge. When you come to the takeoff pop off your edge and turn you head the way you want to spin. Now, bring the board up, bend down and grab it. Hold on as long as you can. Then at about 270 you let go of the grab and spot your landing. Then put your legs down and absorb the impact. Then you ride away. A 360 isn't a big rotation so you don't need to put too much edge pressure on the takeoff, if you do it will kill your speed.