It's a neat piece of science art, and it also tells us something interesting. The arrows show us that the force on the skateboard is constantly changing, both in magnitude as well as in direction. Now the force of gravity obviously isn't changing, so the reason that these force arrows are shrinking and growing and tumbling around is that the skater is changing how their feet pushes and pulls against the board. By applying a variable force that changes both in strength and direction, they're steering the board.
A skateboard is moved by pushing with one foot while the other remains on the board, or by pumping one's legs in structures such as a bowl or half pipe. A skateboard can also be used by simply standing on the deck while on a downward slope and allowing gravity to propel the board and rider. If the rider's leading foot is their right foot, they are said to ride "goofy;" if the rider's leading foot is their left foot, they are said to ride "regular." If the rider is normally regular but chooses to ride goofy, they are said to be riding in "switch," and vice versa. A skater is typically more comfortable pushing with their back foot; choosing to push with the front foot is commonly referred to as riding "mongo", and has negative connotations of style and effectiveness in the skateboarding community.
Punisher Skateboards Warphant measures 31 x 7.5 inch.  It has a 9-Ply Maple Black Board with Concave Deck and Double Kick Tail.  It comes with ABEC-3 Bearings, 5-inch V-style Heavy Duty Alloy Trucks, and Bases.  It uses 54 x 36 mm PU injection molded wheels and PE Riser Pad with PU Cushion and Punisher Logo.  It is perfect for learning and doing tricks.  It is best suited for riders who are 8 years old and above.  It has a 5 rating on Amazon.
Large power is created at the point of action by applying small power to the point of effort. Application of this concept to skateboarding makes the back wheels the fulcrum, the tail the point of effort, and the nose the point of action. Applying power to the tail causes the nose to shoot upwards. When the front foot of the skater levels the nose at a point roughly horizontal to the ground in anticipation of the tail, soon to be leveled likewise by the skater’s back foot, the process smoothly done creates the illusion of the skateboard ‘sticking’ to the feet.
After you’ve properly applied a burst of force to the tail, the top-side of your front foot’s toe should start dragging up your board almost automatically. Eventually, the higher you are able to bring your front foot during lift will determine the apex of your ollie, so work gradually towards lifting your front foot as high as your body allows. Skateboarders who record the highest ollies usually (somehow manage to!) bring their feet higher than their hips!

My problem is that my board always lands crooked when I Ollie. The worst thing is that I even tell myself to “keep your shoulders straight” while I’m doing the Ollie and I still land crooked. I think it’s just hard for people to grasp the simple fact that everything on a skateboard has to be done horizontally which is odd because people don’t walk sideways. We walk straight. Like roller blading for example…. it’s easier for me to roller blade because I’m used to walking and running obviously except with a skateboard everything is as if you were hopping over a fence sideways. Skateboarding is tough.


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