Husband all of a sudden wants to go to the gym?

My husband has always been on the heavier side from day one. He doesn’t have a faithful track record but we have gotten past that at least I thought so until he said he wants to go to the gym I could be over thinking it but why all of a sudden now your not happy with the weight it was out of nowhere and the man won’t even do manual yard work am I over thinking this
Husband all of a sudden wants to go to the gym?
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