Went and rode some trails/jumps for the first time on my mountain bike. I've never been any good in the air, even on my bmx, but I was doing ok for the first time. Some hucker was there and was having me follow him over some of the smaller jumps. Was going fast and hit a small double, thought I was going to case so I sucked the bike up, ended up manualing down the landing and being thrown off sideways. Landed smack on my tailbone and whipped my head backwards onto the hard packed trail, heard my helmet smack. So glad I had one on. My first real crash on the mtb. Two things I'm taking away, always wear a helmet and I still have no fucking bike control in the air at all.