I did this over 20 years ago. I was a salesman, and I remember having record numbers during and after that time.

I haven't tried it again since. But the exercise helped me reinforce the habit of focusing more on the solution than the problem in my daily life.

What I'm speaking about?

The Mental Diet...​

Source: A concept read in Awaken the Giant Within Book by Tony Robbins.
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​The exercise: For 10 days, the goal is not to have bad thoughts and not to complain. As soon as you have one (you will), focus on the solution. If you spend more than 2 minutes obsessing about the problem, you have to start over.
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I started 4 days ago, so I'm ahead of you. Are you ready to join?

7 reasons why I'm doing it.