the moves will vary with specific subgenre of hardcore, the politics of the scene involved, and individual choces of those dancing.
windmill: many variations, but generally includes flailing arms in wide circles, often spinning the entire body in the process. often leads to spin kick or jumping spin kick.
spin kick: a spinning back-kick. if you were to hit anyone it would be with the heel of your foot.
jumping spin kick: jump, spin in midair, and kick forward with your back foot.
floorpunch/ picking up change: bend over, pretend to grab or punch the ground, alternating hands. bring your hand back to your back pocket area (as if putting change in pocket) if you want to not hurt anyone, or flail the arm away from your body violently. while grabbing/ punching with the right hand, stomp with the left foot. and vice versa. can be performed while stationary or while moving sideways or forwards. this can be a violent dance if the kid decides to use his/ her arms (esp. elbows) as weapons.
kids may also be seen running back and forth in front of the band, sometimes jumping a whole damn lot, raising their fists (often with an outstretched index finger) and singing along. kids also pile onto one another and scramble to grab the microphone and sing a line or two if the mic is proferred by the singer of the band.
some of these dances are not considered acceptable at certain shows. kids generally do not spin kick at posi, youthcrew-type shows. it's just not very posi. and there will often be no two-stepping at more metal-influenced shows. some hardcore scenes are more influenced by diy punk ethics, some more by kids wanting to just beat the shit out of each other and wear fancy clothes. this will affect the dancing present at a show in fairly obvious ways.
the other definitions of hardcore dancing present here seem to be more from younger kids who listen to new-school metal-influenced hardcore. they would claim no tie to the punk community or the ethics associated with it. this is obvious from their blatant homophobia and general meathead attitude. they will sell out hardcore pretty qhickly, and if any are straightedge, they won't be for long.
V: to go into a circle of kids wearing tight black hoodies and fight invisable ninjas. This may look dangerous, however the ninjas are invasable and also non-realistic, therefor you rarely get hit and if you do it's takin' one for the team, so get up and do some kartwheels and a spin kick. All the hardasses on the outside of the pit who claim you're a fag for being in, are fags for being out.
It was first made in the early 80s when the genre of hardcore-punk developed from traditional punk. The hardcore punk scene started out with a lot of straigh-edge kids, who dedicated themselves to human rights. Those who who hardcore danced had no intention of injuring people or causing shit in the pit. They were merely expressing the deep respect they had for the band they were listening too, and showing their emotions through dancing. Most of these most involve what looks like flailing, it is more so a fighting. All of the moves have a meaning, and the fight moves represent fighting facists and those who supress the scene (such as people who have defined this word ignorantly, and negatively).
Others may perform moves to represent their humble attitude.
True hardcore kids can have a good time anytime, if a kid falls they will pick him up, if someone wants to start shit with them, they'll make a good effort to calm them down.
It is very unfortunate to see something degrade into such a steriotypically hated ignorance.
picking up change - jumping back and forth with the intention of picking up the change of careless rich people
two-step - similar to skanking with skilled leg swinging motions.
spin kick - a simple "cresent" spining kick
If you still dont understand what dancing is, go to a show and watch kids that know how to dance, then you'll know it's not fighting 'invisible ninjas' or any of that shit.