How do you walk on air in roblox?

There are several ways to walk on air in Roblox. First there could be a game tool that allows the wearer to walk on air. Secondly, There are several peaces of gear that allow you to walk on air for a few seconds. Thirdly, there is a bug known as the fly-glitch which allows you to "walk on air" by strapping a brick to the lower part of your legs.