How to I gain stamina as a pitcher?

I've always been able to throw hard consistently, and I've never been taken out for the other team hitting off me. It's because I walk people when I get tired. How can I be able to go more innings without getting as tired?

How to I gain stamina as a pitcher?
What's the pitch count they tend to take you out at? Besides your usual pitching drills, focus on long toss. Also, when you throw a bullpen, throw more pitches each bullpen. When we start in the beginning of the season we only throw 4-5 sets equating to about 50 pitches. Towards the middle of the season if I don't pitch that week, I will throw maybe an 80-90 pitch bullpen. Just work your way up and make sure if you are getting tired, to stop because if you keep throwing when you are tired, you may end up screwing up your mechanics and maybe even hurting your arm.
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Reply:Eat raw eggs and eat lots of protein.