I'm going to make my soccer teammate throw up
Why do you want to make your soccer teammate throw up?
Because he's our team captain and he works me harder than everyone else, which I think is unfair.
It is unfair of your team captain to work you harder than others, but making him throw up isn't a good idea. You should never jeopardize someone else's health just to get revenge, that's dangerous. This seems like something that you could work out with a conversation, or perhaps even moving to a different team.
We will just have to wait and see.
I think that you should just try talking to him, for real! It is not okay to make other people sick.