There is no governing body that declares any regulations on what constitutes a skateboard or the parts from which it is assembled. Historically, the skateboard has conformed both to contemporary trends and to the ever-evolving array of stunts performed by riders/users, who require a certain functionality from the board. The board shape depends largely upon its desired function. Longboards are a type of skateboard with a longer wheelbase and larger, softer wheels.
In 1978, Alan Gelfand, who was given his nickname "Ollie" by Scott Goodman, learned to perform no-handed aerials in bowls and pools using a gentle raising of the nose and scooping motion to keep the board with the feet. There are numerous references to Alan Gelfand's Ollie with most notably pictures in the 1970s skateboarding magazine "Skateboarder".
Slide your front foot forward – You remembered to angle your front ankle right? Good, now use that to move your board forward in one big rolling motion, and bring your back leg up into your chest. All of this is done at the same time, but it takes practice to get the timing down. Don’t slide your foot out too early though, or you’ll end up with a pretty weak jump, but also, don’t slide it out too late, or it won’t get leveled and you’ll end up in the pavement. Come to think of it, just do it perfect the first time and everything will be great.