Why did he ask me to go to the gym with him?

So this guy I've been sleeping with asked me if I wanted to go to the gym with him. Granted, I am overweight, but it just really surprised me. He seemed like he had though about it, and he again asked me two days afterwards. I'm not really sure what to think of this, as I feel no on has ever had this problem before. Is it a step in the right or wrong direction for a relationship with this guy?
Why did he ask me to go to the gym with him?
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