Why this trick should be IMPOSSIBLE ft. Rodney Mullen - Skateboarding Science

This is pretty long for youtube comment I know, but considering your topic of choice is Physics, that's kind of the name of the game when trying to explain these sorts of things so please bare with me because I'm one of those skateboarders who is into physics. I'm really sad to say, there are some really big/ incorrect leaps here throughout the video regarding the physics. First, the intermediate axis theorem doesn't really seem to apply because there's a force (the scooping foot) acting on the board through the entire rotation to create the spin. This isn't so much a flip in the same sense as a kickflip is because it's more like spinning a banana around your finger as opposed to freely flipping it in the air and then catching it upon completion of the flip. Notice how the tool in the space station is not acted upon by another force in this way while it spins. It is also much easier to see why this is not an intermediate axis flip when viewed in someone who hasn't been doing them for decades as it commonly results in an accidental 360 shuvit - a full long axis "flip" - when your foot doesn't act as that force (especially true when regular rather than nollie because as Rodney says, nollie "goes with the grain" ). A more accurate intermediate axis flip does exist and is called a Monster Flip which flips along the intermediate axis and does so free from the feet. This trick has been done plenty of times (on youtube), but it's not a very popular trick which is why you may have missed it. Also when he does the other trick that "starts like an impossible" (which is actually a casper 360 flip) he is flipping it in large part with the flick of his feet as opposed to it just happening like that up release. Lastly, when you pop your board there is more going on physically - part of why it seems to spring up and not just tip up like a seesaw is because you are transferring kinetic energy from your feet to the wood around the fulcrum and at the tip of the tail that is then released in the opposite direction as you snap the tail against the ground and lift your feet so they are no longer acting against the board. In a way it's more like a pogo stick than you let on because the tensile strength/ stiffness of the wood acting as a spring (think diving board). If you just step onto the tail fairly hard you'll notice that the board tends to bounce a bit before settling instead of just stopping, similar to holding a steel ruler down at the edge of a desk with a bit hanging off (to create the fulcrum) and making it spring to make sounds - the difference here being that not only is this happening but it's combining this with the pivot around the tip of the tail after it hits the ground along with the drag of your front foot. The front foot plays a much bigger part than what you let on too as it shifts the fulcrum towards the origin of the intermediate axis in the air and levels out the board around it. Side note: It's also possible to ollie without your tail even touching the ground because with a little practice you can generate enough upward movement just with the friction of your front foot as you drag it against the grip tape to level out.  PS: Research on skateboarding physics is totally the coolest and that was a little offensive to the skatenerds of the world (there's alot of us). :/