You really need to prioritize in life, figuring out in what order you should divide up your time and energy. If you don’t get that sort of system set by a certain age, you’ll lack focus and your life will be out of balance.
No matter what, though, I keep up my running. Running every day is a kind of lifeline for me, so I’m not going to lay off or quit just because I’m busy. If I used being busy as an excuse not to run, I’d never run again. I have only a few reasons to keep on running, and a truckload of them to quit. All I can do is keep those few reasons nicely polished.
Focus - the ability to concentrate all your limited talents on whatever’s critical at the moment. Without that you can’t accomplish anything of value, while, if you can focus effectively, you’ll be able to compensate for an erratic talent or even a shortage of it. I generally concentrate on work for three or four hours every morning. I sit at my desk and focus totally on what I’m writing. I don’t see anything else, I don’t think about anything else.
Endurance. If you concentrate on writing three or four hours a day and feel tired after a week of this, you’re not going to be able to write a long work. What’s needed for a writer of fiction - at least one who hopes to write a novel - is the energy to focus every day for half a year, or a year, two years.
Raymond Chandler once confessed that even if he didn’t write anything, he made sure he sat down at his desk every single day and concentrated. I understand the purpose behind his doing this. This is the way Chandler gave himself the physical stamina a professional writer needs, quietly strengthening his willpower. This sort of daily training is indispensable.
As an action that deviates from the ordinary yet doesn’t violate basic values, you’d expect it to afford you a special sort of self-awareness. It should add a few new elements to your inventory in understanding who you are. And as a result, your view of your life, its colors and shape, should be transformed.