Hey i can do them from time to time!! I landed a few good ones a while ago. Lately it has been too cold to really try them consistently
haha
You gotta pop the three like you would a hop bar. Whrn you pull you gotta push out and keep your legs straight and pinch the seat. I think 270 bars on mellow banks are the best way to do it honestly. You can go at it like a 180 bar until it is almost a full 360. I am sure youll do it if you can 180 bar.
I think it is better to think of the 360 as a slower spin you will have more time to throw the barspin. They are easy off a steeper bank too. But do 270 bars on a mellow bank and you will advance into a full 360 bar. Pop the three high and push out as if it were a barspin. Because it kinda is haha. And when you do the three you are gonna turn your head but have your eyes on the bars. It is awkward but you can do it.
References: OneGuyIlluminatiEye, robinson79, Brian Griffin, The Horror Contact, StoreBoughtChild, C_Johnsonbmx, dkTechEthan, etc.