It quite easy.
Start a blog, 90% of people don’t have one. Write 1 post per day, 90% of bloggers can’t do that.
There you go, you are now officially in the 99th percentile.
Before you get too excited, just so you know, 1% of 6 billion is 60 million, and they are your real competitors.
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We all need challenges and the sense of euphoria that comes from achieving a difficult personal goal. I like your NSB idea — it’s not hard but 99% of people won’t do it and can’t do it.
Just like running a marathon — it is a difficult personal goal that ordinary people can achieve but 99.99 population won’t do it. We may not be able to conquer ourselves by climbing Everest, but we can conquer ourselves by completing a marathon.