Step 1: Open Console
Step 2: Type in sv_enablebunnyhopping 1
Step 3: For easier bunnyhop type in the console sv_autobunnyhopping 1
Step 4: Now for the final command type sv_airaccelerate 800

I hope this guide helped you as its so useless for no reason

Oh and always get some acceleration before you bhop and only press A & D at the same time