Surf settings on Counter-strike, conditon Zero, Source.

Hard Surfing: Use 100 Airaccelerate, Command in Console: Sv_airaccelerate 100.

Medium Surfing: Use 150 Airaccelerate, Command in Console: Sv_airaccelerate 150.

Easy Surfing: Use 400 Airaccelerate, Command in Console: Sv_airaccelerate 400.

Really easy Surfing (Surfing for noobs): Use 10000 airaccelerate and 760 gravity, Command in Console: Sv_airaccelerate 10000 Sv_gravity 760.

Here Is a movie with A guy Skillsurfing.