Why would you ask a guy to be your gym buddy?

A girl I've kinda know for 3 years randomly asked me to help her get in shape and be her gym buddy. I am BMI overweight so I know I'm not the picture of health. This girl and I have always had some chemistry but we've never hung out properly or anything and now, after not really speaking for a couple of years she wants to workout with me.

Someone help me make sense of this?

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Why would you ask a guy to be your gym buddy?
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