10. Longevity
I recently read several studies that were done on professional wrestler averages. The studies ranged everywhere from the number of title reigns to average wins per year. However, the one study that stuck out, was the average career length for each professional wrestler. The average this particular study came up with, was 7 years, and that was being generous. Essentially, the study stated that the average number of years that each wrestler was competing at a professional level, was roughly seven years.
With this in mind, Mark Henry surpassed 20 years of being with the WWE, this year. I know that today's wrestlers have access to more modern studies, medical expertise and so on. But, very few compete at the highest level as long as Mark Henry has, and just as he said before..."there's still a lot of gas left in the tank."