I definitely agree the attempt at directly correlating gym plans to dating is often mis-played. But, there’s solid advice out there about using basic fitness and exercise to combat depression and mood problems. Even if lifting iron won’t do a whole lot for you, occasionally going out for a walk or riding on a bike/kayak/etc will often improve your attitude. And yeah, in the end being less depressed is probably good for dating - just not good to form the direct expectation.