as well. The famous placing of the board on the feet and then jumping was created in 1987 by Nathan Lipor. Combining spins and flips is extremely popular in today's culture. A common trick in skateboarding lines is a 360 flip, or tre flip. A 360 flip is the combination of a skateboard spinning 360 degrees and a kickflip. There are also double kickflips and triple kickflips, which are very difficult. Freestyle Freestyle skateboarding tricks are tricks specifically associated with freestyle skateboarding. They are part of the building blocks and some of the most important reference points for tricks which have evolved to form street skateboarding. Slides and grinds Slides and grinds involve getting the board up on some type of ledge, rail, or coping and sliding or grinding along the board or trucks, respectively. When it is primarily the board which is contacting the edge, it is called a slide; when it is the truck, it is a grind. Grinding and sliding skateboards started with sliding the board on parking blocks and curbs, then extended to using the coping on swimming pools, then stairway handrails, and has now been expanded to include almost every possible type of edge. Grinds and slides on street environments were brought to mainstream skateboarding by professional skateboarders Natas Kaupas and Mark Gonzales. Manuals A manual is a balancing trick where a skateboarder balances on either the front two or rear two wheels, without the other two wheels or any other part of the skateboard touching the ground for the entire duration of the trick. The trick is often performed at speed and technical skateboarders such as Daewon Song are renowned for performing tricks such as the kickflip both in and out of the trick, whilst also simultaneously doing so up onto, over and off ledges, blocks, benches and other street obstacles. References Skateboarding Sports techniques