At work we talk about work life balance, this nirvana state where you have the balance between your work life and personal life that suits you. In that state you will be perfectly productive while at work because your life feels balanced and you know you have the time and energy to do the things in your personal life you enjoy. Of course it’s not that simple but the principle is something I do agree with, I know I work better when I feel I have the right balance and the energy I’m putting into work (and is being asked of me) is in balance. I’ve realised to my cost in January that the principle also applies to running and the balance between running and the rest of your life. That you can’t commit to an intensive training plan with all the energy (mentally and physically) that requires if the rest of your life has significant demands to. It just doesn’t work, something has to break and likely that thing is you.