I coach only women, but stole the idea from OSU football, so it might work with either gender. I use a reward system where the girls earn “stickers”, “smiley faces” or whatever you want to award. Make it something simple and cheap. I make an arbitrary goal, let’s say, 50 and once that number is reached, we will take day and play a game, go get ice cream, have a picnic or play in the ocean. It brings the girls together because they all want to earn the reward for themselves and for the team.