#2 Travel
Being a WWE superstar is extremely difficult in terms of the actual wrestling itself, but many ex-performers have come out and said that it's the miles travelling on the road that does the most damage. One of the men that strongly believes in this idea is, of course, Mr Brock Lesnar who has highlighted his hatred of the WWE road schedule on many different occasions over the years.
Now that he's on a part time schedule things aren't so bad, but in the UFC he never would've had to contend with such stressful circumstances. Lesnar would've had a training camp to travel to and from, then he'd have a few media appearances before the eventual fight. Simple, clean cut and no where near as much unnecessary travel for the big fella to complain about.
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For our final point, it comes down to one very specific factor.