How come baseball pitchers don't start every game?

How come baseball pitchers don't start every game? If its because they need to rest, than they are really lazy and week.|||they need rest......DUH|||you try throwing 100 pitches with full effort and tell me how you feel the next day|||It's surprising nobody has put the entire staff on a 30-pitch-a -day limit.|||starting pitchers use all their energy just for one pitch and their pitch count can go to 100 and they feel dead the next day.|||you are an idiot if they are so lazy and weak then i assume you will go out and throw 100 pitches at 90 mph and do the same thing the next day.|||Are lazy and weak? Let me see you throw around 90 pitches at the range around 80-100 mph.





PS- How is it possible for someone to be playing in the MLB and be weak at the same time? Great! I learned something new today.





So, you are the smartest in this section, why do we care? Never even seen your display nick and yet you're the smartest? That's cool.|||CONGRATULATIONS!! You are in the running for dumbest question ever, I hope you win!!





EDIT:


"I am smarter than everyone here, so don't tell me this a stupid question"





really..your smarter then everyone here?? Your right this a stupid question....good grammar tard.|||sometimes they are late getting out of the showers, some of those guys like to beat the meat in the shower before pitching.|||really jean c. your queen GET A LIFE!!





its because they go out and give it their all and pitch between 90 and 130 pitches and you call them lazy.





pitchers pitched everyday in the 20s and 30s because they didn't have the technology to count pitches and the pitchers didn't care as much about their arms|||For the same reason that bodybuilders don't work the same bodyparts on consecutive days. The body grows and recovers between exercise sessions, or in this case, between starts. Plus, the human body was not made to throw overhand, so there are a lot of small, supporting muscles in the shoulder that must have time to recover.





This is one of the stupidest questions on here in a long time, but it has a lot of competition for the title of "Stupidest question of all time". And one more thing- "week" describes a period of time equal to 7 days. "Weak" is the word you were looking for here, which describes a lack of strength.|||Because it would absolutely kill their arm.|||Cause the job he has to do is so demanding, that, the people who run baseball know from experience how many days off a person needs for the work they do. :)