How do I get my character to be committed to the slide animation?

What do you mean? And how do I make my character move while in the slide? Right now I want it to be set up to where whenever you slide, right when you slide at the beginning of it you get a slight boost of speed, but then it slows down to slightly below the regular running speed until the end of the animation. Do you know how I can get the animation to move and to do that?