How do I make this boost thing on Source SDK?

[xCookie]

Hey guys I was wondering how do I make this boost thing on TF2 Source SDK Please respond I'm making a idle map

www.youtube.com/watch?v=qk_MZ640Z-I

 

[Lampenpam]

Create a trigger_push

 

[xCookie]

Create a trigger_push

Thank you so much