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There is no reason to believe.
There is NO reason to believe.
In fact there is a mountain of evidence to suggest you should not believe.
I've started six ultramarathons and finished one. The one I did finish I was DFL and it took me over nine hours to do 31 miles (16:49 pace if you are keeping score at home).
The other races I have missed cutoffs because I slowed down and quit or just quit outright and dropped. I've puked multiple times, gotten blisters, had breathing problems, knee problems, plantar fasciitis, and generally been dehydrated in every race I have run. In fact it may be impossible for me to stay hydrated. I've never peed during a race (a normal sign of proper hydration) and I probably sweat more than my stomach can possibly take in. My knees sound like Rice Krispies every time I bend them. Sometimes my nose/throat swells up while running and it feels like I am "breathing" through my ear. No really. I'd say I wear orthopedic shoes and get sick just smelling booze, but that would be piling on. Physically I am weak.
I weigh 250 lbs. Enough said.
I don't run fast, in fact I probably couldn't run under 28 minutes in a 5k. My marathon PR is 5:15 and I've been as slow as six hours on a course with no elevation gain. I've never run more than forty miles and the time I did I thought I was going into shock afterwards.
I'm not a good climber, even power walking. The piano on my back slows me down. I don't have the strength or will to power walk (more like stumblin', runblin' and bumblin') and thirty minute miles going up hills are not abnormal.
I don't run fast down hills. My knees/feet hurt after a few hours and I'm too tentative to gain back much of the time I lost ambling up the hill.
When I'm on level ground I go slow and slower. If I start off doing five minutes of running for every one minute of walking, it isn't very long before that trend is reversed and I'm walking five times more than I run.
I'm a quitter. Evidence has shown that I'm not willing to endure the pain and push through the bad patches. My willpower wanes when things get tough and many times all I can think about is quitting.
I'm a perfectionist. The first time anything happens which could vaguely be interpreted as bad, or a mistake, I jump to complete and abject failure. I accept defeat. In fact I rush to defeat, I embrace it, look for it, make friends with it, and translate anything that happens to mean defeat. Mentally I am weak.
I'm five weeks out from Leadville and had another epic failure at an ultra. At the North Fork 50 yesterday I did worse than I did the previous year. 20 miles, fell apart after two hours, had some strange breathing problems, stumbled around for a few more hours and dropped.
Bottom line: I suck at running, and have no business trying to do ultramarathons.
My response to all of this?