Are you looking for more aggressive runners on the bases, players that will take an extra base and be willing to slide when the play is close? If so then you need to have your team sliding during practice, and the best way for that to happen is to let them practice in pants. I’m not talking Levi’s Jeans (or whatever the popular jeans are these days). I’m talking baseball pants. I know they aren’t that popular with travelball teams but did you ever wonder why so many college teams wear them? It’s mainly to help with sliding and to make it easier for their players to be aggressive on the bases. Switch to pants during practice and see how much it helps their baserunning.