Doing __ exercise just for fun? Bad idea in the long run?

I have a pullup bar basically always set up and sometimes I just do pushups for the hell of it. I also do full workouts though..are these "for fun" exercises messing up my rest period? Sometimes I just do 5 pullups or so when I'm walking through the hallway and things like that.

Good or bad in the long run?

 

Those exercises only target certain muscle groups. If you eventually gain muscle from doing this, you will look very weird in the long run since you'll have muscle in some areas and be scrawny in other areas.

 

No that won't mess you up if you do those once in awhile. And you said you're lifting all your other muscles so you should be in good shape.