i just turned 17. im 5'6 roughly 140...i play baseball seriously and am looking to play it in college and even past that..i was wondering whether i should join a gym and go everyday ( if so what type of weights/muscles should i workout ) , or just do push ups and stretch whenever i have free time... i know practicing baseball is most important and i will practice no matter whether i am going to the gym or just woeking out at home. also a gym can get kind of expensive ( 40 a month ) so push ups would be preferable...does it really make a big difference?