One thing that kinda surprised me about academia and later on in tech is that, a lot of the highly successful and accomplished men (scientists/researcher/so called visionaries in certain fields) have good/great physique and look like they routinely work out. I'm talking about probably spending precious hour or two every day out of their busy lives to work out, which is something that always interest me a lot less than anything intellectual.

So, is this just correlation of someone being more in control of their life style or is there something significant to it? Is the secret to reach the next level not actually studying more, but counterintuitively, to exercise more?