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Accelerated Back Hopping

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Accelerated Back Hopping (ABH for short) is a Glitch, and it's the main method of movement on OrangeBox Engine-based games. ABH replaces Bunnyhopping, which was fixed in the OrangeBox Engine. It is also significantly faster than bunnyhopping.

How to

Jump forward, turn around in the air and jump right as you land. It's recommended not to hold S or W (or your respective keys for moving forwards and back) while ABHing. Binding +jump to mouse wheel or using a jumping script is recommended as it makes timing jumps a lot easier.

ABHing and Bunnyhopping comparison chart, shows the speed gain on each jump (no sprint).

Explanation

When you exceed the game's speed limit, the game tries to slows you down whenever you jump, back to the desired speed. By default the game thinks that you're moving forwards, so when you exceed the speed limit, it'll accelerate you backward. If you are facing backward, this will only increase your speed. So, the faster you're going - the more you will get accelerated.
The speed limit varies:

Conditions Speed limit
While crouching 209 UPS (165 in Portal)
While walking 225 UPS
While running 285 UPS
While sprinting 352 UPS

This is why it is generally recommended to crouch while ABH-ing, as it's speed limit is the lowest of all.

Variants

There are some ways to gain speed similar to ABH:

Accelerated Forward Hopping (AFH)
Once you've gained some speed while ABH-ing, you can turn around and start pressing S every time you jump. This will make the game think that you are traveling backward and so it will try to decelerate you by applying force the direction you are facing, so you still gain speed.
In Half-Life 2, this is very hard to do because you can only press S in a short window of time. Holding S will result in a complete stop because you are deliberately slowing yourself down. However in Portal, because air control is significantly reduced, you can hold S to execute the trick.








Accelerated Side Hopping (ASH)
This variant of ABH allows you to look forwards similar to AFH. To execute this, start an ABH but instead of turning around in the air, adjust your view slightly to the left (or right) and hold S and D (or S and A) to gain speed. Unlike AFH, if you are ASH-ing close to the ground, you can hold your inputs and adjust your aim accordingly to consistently do the trick. However, if you're in the middle of a launch, releasing your inputs is recommended in order not to disturb with your jump and to allow better maneuverability while you're in the air.
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