Yes, this trick of applying a variation of BHopping backwards, called *Accelerated Back Hopping*, can be used in certain Source Engine games to great effect, gaining great amounts of speed very quickly. This glitch uses the same skills as the previously-mentioned BHopping, with the added twist of turning around midair after initially jumping forward.

This glitch is caused by a quirk of the Source physics engine as implemented in these particular games: when your speed is too fast, it is capped. However, this cap is created by applying force against the player in the direction that the player jumped in. This technique makes it so you're jumping backwards, but the engine applies a force to your front to try to slow you (since you initially jumped forwards), which instead makes you move backwards even faster. With several jumps this creates massive speed, speedrunners use this to skip past large sections of levels, such as the large open-air maps of Half-Life 2.
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