What kind of physical exercises do you maintain to be fit and healthy?

Hi, folks, I was wondering what kind of physical exercises should be considered as a bare minimum to be fit?

I don't want to be a bodybuilder. I just want to be healthy, not to get diabetes, back pain, cancer or heart issues. I try to walk regularly. But, I am getting fat, having back pain and sick on every seasonal change!

So, what do you do to be healthy?

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