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How can I bulid up muscle in my stomach and arms over the winter?

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Ok well, I'm in an athletics club and I do a lot of sport that involves me having to be able to hit heavy things (like people in rugby) and to throw, and also to look better and too have more muscle.
So I'd like to know what exercises can I do at home and not with much equiptment to build up my arms (biceps and triceps) and my stomach (abs)
Over the winter I have too bulid up my core strength so I'll have a good chance of doing well in the summer time (when all the competitiosn happen)
Cheers guys.
Also I might have to say that I'm 15 and weight just below 10 stone)