I'm trying to visulaize crashing practicing a tail whip... wow, you must have put a ton of energy into it. We were messing around just with the idea at camp.
You start with a rear wheel lift before you attempt a tail whip.
Flats or clips, get out of the saddle in the attack position. If you using flat pedals, the motion to keep your feet from coming loose is almost a "clawing" motion, toes pointed down and feet pulling back and up. You almost want to preload and try for a little lift.
With clips, it's easier, almost cheating. Same thing, attack position, preload and pop the rear wheel up. Once you can get your rear wheel off the ground, then you try and move it around, little by little
If you were going to set up a bike for practicing this kind of thing, it would be more like a trials ( not trails) bike...think Hans Rey, the guys who jump up onto picnic tables and so on.
I often think that if I'd been bmx-ing as a kid, I'd be 100X the rider I am today.
Re, those videos. I have one that the guy made that's not on his site, it's a blooper reel of edits, mainly all the crashes that he doesn't put in the regular videos... my nickname for it is "how mere mortals ride"
~Irulan
2015 Liv Intrigue 2
Pro Mongoose Titanium Singlespeed
2012 Trek Madone 4.6 Compact SRAM