So the proper foot placement for the ollie is with the ball of your back foot horizontal on the tail of your skateboard.  And your front foot centered on your board right behind the front trucks.  You may find that moving your feet around in different positions are more comfortable.  This is fine,  everybody can learn how to skateboard their own way.
In the case that you didn't gave up after a hundred over tries, you'll start to develop a reaction to landing it. After a few hundred more tries, you'll feel you are getting off the ground and getting little air. And once you reach the thousandth try, you'll already be doing it whilst rolling and the next thousandth tries will be spent on clearing small cracks n obstacles and working towards ollieng up bigger obstacles n up ledges.
The skater can gain greater clearance from the ground by jumping higher, popping faster, sliding the front foot farther forwards (starting the jump with the front foot farther back), and pulling the legs higher into the chest to raise the feet higher. Skaters attempting record-setting ollies even contort the legs so that board and feet are not directly below them, allowing the board to rise at or just below the level of the pelvis.
The top part of the truck is screwed to the deck and is called the baseplate, and beneath it is the hanger. The axle runs through the hanger. Between the baseplate and the hanger are bushings, also rubbers or grommets, that provide the cushion mechanism for turning the skateboard. The bushings cushion the truck when it turns. The stiffer the bushings, the more resistant the skateboard is to turning. The softer the bushings, the easier it is to turn. Bushings come in varying shapes and urethane formulas as well as durometers, which may affect turning, rebound and durability. A bolt called a kingpin holds these parts together and fits inside the bushings. Thus by tightening or loosening the kingpin nut, the trucks can be adjusted loosely for better turning and tighter for more stability (useful when landing tricks). Standard kingpin nut size is 3/8" - 24tpi. The position of the hanger respect to the baseplate is also determined by the pivot, a rod that slots into the corresponding seat in the baseplate. The pivot stops the hanger from rotating around the kingpin. The pivot must allow some movement around the bushings and therefore is not a perfect fit. The space between the pivot and its seat in the baseplate is filled by a pivot cup, a plastic part that will take most of the wear and tear of the pivot and assist in centering the hanger needs to be lubricated every so often.
One foot on the tail, (by foot I mean the ball of the foot which is just behind the big toe) the other foot is about an inch behind the bolts(screws) for the front truck. Basically, the back foot quickly pushes the tail down, and right when the tail of the board strikes the ground, the back foot jumps up… the tail of the board will follow up with the foot when the front foot slides forward slightly, which pivots the tail of the board upwards. Since the front truck comes off the ground first, getting the back truck up is the trick.
Skateboarding is all about creativity and finding new challenges. A great way to explore skateboarding is to ride different shaped boards, wider trucks, and different size wheels. As you progress and start to ride new terrain and skate different kinds of spots, you may find one wheel size or board shape works better for you than another. There’s no wrong or right anything. There are no rules. Except for maybe one, and that is to keep skating. Skate as often as you can. Never is this more true than in the beginning while you’re developing your style and fundamentals.

It is a mini-cruiser, which is known for its strength as well as its ability to offer real value for the money you spent. This skateboard can also be expected to deliver an impressive performance – thanks to the Abec 7 skatro bearings used in it. There are also 59-mm urethane wheels and the 3-inch GOLD aluminum trucks that can help smoothen each ride.
The Bamboo Skateboards Galaxy Series Cosmic Cloud Skateboard Deck is an excellent option. This concave board is made exclusively of a bamboo hybrid, rather than pure maple. This means the deck is lighter, stronger, more flexible and can even absorb shock better. The non-carbonized, light-wood deck is made of 6-ply wood and is in its fourth generation of designs.
A rushed take-off might be the problem here. Steps 2-4 of this trick tip could help you out. In order to make your feet “stick” to the board, you have to do the movement fluidly. But don’t stress yourself out! You should rather start with some preliminary exercises until you feel safe while ollieing. It is also important to pull your foot up to your board’s nose in a straight manner to prevent it from spinning.
So now that you have an idea of what size and shape board you like, it’s time to choose a brand. A popular size is an 8.5 skateboard deck. If you were looking for a size 8.5 skateboard deck, you could narrow the decks offered on CCS.com to fit in the 8.25 - 8.5 range. This will show you all the boards in that range, and significantly reduce the boards you have to look through. Now, if you don’t have a preference on board brands, find a graphic you like and you’re all set. If this is your first skateboard or are still learning about what wood and brands you prefer, we recommend checking out a CCS Skateboard. They give you a bang for your buck, that's for sure.

To summarize, a skateboarder's feet need to do two things successfully to complete an ollie. They need to provide a changing force to move the board correctly (so that the combined force of gravity and the skater's feet add up to the green arrows above), and they need to provide different amounts of force with each foot (shown by the red and blue arrows above) to steer and turn the board into the right orientation.

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