>> reporter: mike matheny is the manager of the st. louis cardinals.he balked. tell me about "the matheny manifesto." >> i have seen coaching go well. and sometimes badly. parents with warped ideas. watching kids quit at a high rate. i listed things obvious to me. >> reporter: "the matheny manifesto" a letter he wrote to parents outlining how things would have to be different for him to take the job. i believe the biggest role a parent can play is to be a silent source of encouragement. this is all about the boys. how easy or hard was it for you, as parents, to change your behavior on game day? >> um terrible. >> horrible. >> we had grown up yelling. we thought it was uncouraging. you can do it you can do it. >> the kids just enjoyed the game. >> reporter: they didn't win a championship. but every one of the boys came away a better player. and in their own minds, better and more confident. >> it was the best coachg expeence i have f had. i learned so much. >> i think it was a lot different because he put more emphasis on it's not all about baseball. it

>> reporter: mike matheny is the manager of the st. louis cardinals.naging his son's little league team, he balked. tell me about "the matheny manifesto." >> i have seen coaching go well. and i have seen it go extremely bad as well. parents with warped ideas. of how they needed to support their kids and watching kids quit at a high rate. so i started listing out some of the things that were obvious to me. >> reporter: "the matheny manifesto," a letter he wrote to parents outlining how things would have to be different for him to take the job. of managing these little-leaguers. i believe the biggest role a parent can play is to be a silent source of encouragement. this is all about the boys. how easy or hard was it for you, as parents, to change your own behavior on game day? >> um, terrible. >> horrible. >> we had grown up yelling. we thought it was encouraging. you can do it, you can do it. >> and what we saw, at the end of the day, the kids just enjoyed the game. >> reporter: they didn't win a championship. but every one of the boys came away a bette