If you can change, so can other people.
We often wonder how successful people get to become so successful. In reality, the secret is much simpler than you know - go where the opportunities are. Many people want to be successful, but they don't want to make an effort to achieve it. If they had simply made sure that they were there, where the action is, they would have increased their likelihood of success to a very high degree. They say that you've got to be in it to win it. It's the same with being in the right place at the right time. If you don't show up, if you don't attend, how can you take advantage of what is on offer?
Long days at work aren't just physically draining, they can be emotionally draining as well. It's important to maintain your physical health, but it's also important to build your psychological stamina.