Yes! Everything I learned when I was young told me a) you have to be *very serious* about working out if you are going to do it and b) it's mostly about looking good.

Both of those turned out to be huge fallacies. I'm 40 now and not very serious about working out, but I do it reliably (on an irregular schedule) and I don't target specific muscles etc to try to make myself look a certain way. The result is that I am just plain healthier and feel great. That has many second order effects.