How can you stay fit and focus on school?

Anonymous
I'm not too big or too skinny but I really just need to tone up. Also how long should I work out? And how do you find time when you have to focus on schoolwork? What is your routine and how do you manage it when you have a lot of school stress?
I'm 15, 5'1", and weight 117 lbs.
How can you stay fit and focus on school?
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