Having your girlfriend/boyfriend as a work out buddy... good or bad idea?

I'm single at the moment but I've always wondered what it'd be like if you had your partner as your gym buddy. I think it'd be kinda cool because I'm really into that kind of stuff and it'd be good because it's a hobby we could share. Some of my friends have tried this and sort of had a mixed reaction, some people just use a gym as a "escape"... So what's your opinion? Would love to hear from you if you've tried this and it's worked/hasn't worked.
Having your girlfriend/boyfriend as a work out buddy... good or bad idea?
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