https://www.youtube.com/watch?v=HSM0gG3UL3M&feature=plcp
Should give you some ideas.
Everyone’s talking about crouching then jumping, or vice versa. Does anyone do it like me? I just hold W, Space and Ctrl at the same time.
Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.