Roller coaster designer, Korey Kiepert, from the Gravity Group took time out at IAAPA to explain what's involved with designing a coaster, and how coasters actually work.

The Gravity Group is responsible for many of the much loved wooden coasters around the world, from Hades 360 in Mount Olympus to Twister at GronaLund to Tonerre 2 Zeus at Parc Asterix.

Many of their traditional wooden coasters even feature inversions.