I'll go one further and say that very few people in the entire human population would be competitive with Usain Bolt in the 100 meter when he was setting record

I'll go one further and say that very few people in the entire human population would be competitive with Usain Bolt in the 100 meter when he was setting records, no matter what kind of training they had. There would be a few more beyond the world class sprinters Bolt was demolishing. Similarly, there would be very few people who could beat Nadal in 5 sets on a clay surface. Djokovic happens to be one of those few. But, those are extreme outliers. Still though, we could ask how many people in the entire human population could run under a 4 minute mile with any amount of training, time and resources? Obviously more than have done it, but how many? Certainly not remotely close to everyone.