Longboard - A longboard is similar to a cruiser in terms of overall use and getting around town. Longboards start at about 42 inches in length and about 9 inches in width. When you buy a longboard, the wheel base of the trucks is usually wider and they have wheels starting at roughly 60mm. This gives you more maneuverability and a very smooth ride.
My problem is Everytime I try to pop the back it’s not hard enough and I get no air. The article says to jump up so I do it physically and sometimes it seems to help. But when I watch skate videos and other skaters It doesn’t appear they are actually jumping up. They just seem to be popping the board. So should I physically jump? May sound stupid but it’s something I struggle with.

The wheels of a skateboard are usually made of polyurethane, and come in many different sizes and shapes to suit different types of skating. Larger diameters (55–85 mm) roll faster, and move more easily over cracks in pavement and are better for transition skateboarding. Smaller diameters (48–54 mm) keep the board closer to the ground, require less force to accelerate and produce a lower center of gravity which allows for a better response time, but also make for a slower top speed and are better for street skateboarding. Wheels also are available in a variety of hardnesses usually measured on the Shore durometer "A" scale. Again like car tires, wheels range from the very soft (about Shore A 75) to the very hard (about Shore A 101). As the A scale stops at 100, any wheels labeled 101A or higher are harder, but do not use the appropriate durometer scale. Some wheel manufacturers now use the "B" or "D" scales, which have a larger and more accurate range of hardness. Modern street skaters prefer medium-sized wheels (usually 51–54 mm), as small wheels with lighter trucks can make tricks like kickflips and other flip tricks easier by keeping the center of gravity of the skateboard closer to the deck, thus making the deck easier to spin. Street wheels are harder (A 100/A 101). Vertical ramp or "vert" skating requires larger wheels (usually 55–65 mm), as it involves higher speeds. Vert wheels are also usually slightly softer (A 98/ A 99), allowing them to maintain high speed on ramps without sliding. Slalom skating requires even larger wheels (60–75 mm) to sustain the highest speeds possible. They also need to be soft and have better grip to make the tight and frequent turns in slalom racing. Even larger wheels are used in longboarding and downhill skateboarding. Sizes range from 65 mm to 100 mm. These extreme sizes of wheels almost always have cores of hard plastic that can be made thinner and lighter than a solid polyurethane wheel. They are often used by skateboard videographers as well, as the large soft wheels allow for smooth and easy movement over any terrain.
The Krown Rookie Skateboard Complete 7.5 comes with thick, sturdy 7-ply maple wood deck. It gives you more control and permits you to perform various tricks. It features carbon steel ABEC-3 bearings, aluminum trucks, bushings and 54mm x 34mm wheels. This board is perfect for kids who are 8 years and older. It has a maximum weight capacity of up to 220 lbs.
This board is an excellent option for beginners because of its simplicity and durability. The lightly concave design allows for simple turns but doesn’t require the rider to be an excellent navigator. You can start off riding this deck down the street and use it as you learn ollies, kickflips and how to drop in to a half pipe. It will withstand it all and look good doing it.  
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