How can I exercise more and eat healthier when I don't have much time?

Okay, I want to lose some weight and shape up a bit. I don't have a gym membership nor do I have time to go to the gym. I don't have much time to exercise, and when I do I usually need to practice playing guitar. Also I want to eat healthier, but I again don't have time to research it much.
Do you guys have any help? I really am desperate.
How can I exercise more and eat healthier when I don't have much time?
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