The main difference between an air walker and a cross trainer is that cross trainers, also known as ellipticals, are usually larger and more solid than air walkers. They provide a unique elliptical range of motion compared to the back and forth motion of the air walker. Cross trainers are also more expensive than air walkers and provide a greater range of resistance levels. The air walker is very similar to the cross trainer in that they both allow for a full striding motion in suspension.