Check out what we think is a solid NBD from Sebastien Toutant: a massive flatspun backside 900 off his heel edge, stomped while practicing at the Mile High in Perisher, Australia.

Spinning backside off the heels is flat-out awkward. It requires a whole bunch of pre-wind before you leave the lip, makes it way harder to pop, and puts you at risk of scrubbing speed at the lip (or worse, catching your edge right before you take off...).

Halldor Helgason is one of the riders who springs to mind as making this one popular, and over the last few years we've seen 360, 540 and even 720 versions go down from Halldor and quite recently, Norwegian Joachim Krogstie.

But as far as we can tell, adding that extra 180 and turning a back 720 into a backside 900 off the heels has never been stomped on camera before, so big props to Sebastien Toutant for stepping up on what is undoubtedly a pretty scary trick on a jump of that size.

Although it may not exactly seem like much of an achievement to turn a 720 into a 900, it's the little things like this that all add up to the overall progression of snowboarding, and in this case, we think it's a trick that's definitely worth shouting about.

Some will undoubtedly argue that David Benedek, Andreas Wiig, Travis Parker and the like have been doing corked variations of backside spins off the heels since the Robot Food days, but as far as we can tell, this is the biggest of the completely flat variation we've seen to date.

Watch another angle of Seb's backside 900 off the heels at the 2.23 mark in this edit from The Mile High.