If there is a problem on an airplane, the instructions say that you should put on your own mask and then help others.  As Fathers, Husbands, Leaders, taking care of yourself is similar.  Create the best you possibly can so that you can then give to others even more!  Is exercise selfish?  Not in my opinion.  In fact, I think it is selfish to neglect your body and mind.  The key is how you fit in the time it takes to exercise and take care of yourself.