Trail Runners Were Asked About Their Biggest First 50K Mistakes. The Answers Are Pure Gold.

The question was simple: What’s one thing you did in your first 50K that you’d never do again?

What came back was a flood of confessions, hard-earned lessons, and a few stories so painful they’re funny. Hundreds of runners who have toed the line at their first ultra opened up about the rookie mistakes that cost them time, comfort, and in a few cases their toenails.

If you have a 50K on your calendar, consider this your shortcut. These are the lessons people learned the hard way, so you don’t have to.

Going Out Too Fast is the Mistake Almost Everyone Makes

If there was one universal regret, this was it. Comment after comment said the same thing in different words.

Runners admitted to treating the first six miles like a 10K, chasing the leaders off the start line, and locking into a pace that felt easy early and impossible later. One runner held 8 to 9 minute miles out of the gate and learned that pace simply was not sustainable for 31 miles. Another went off at 6:30 pace with the front pack and regretted it by mile two.

The fix is almost boring in its simplicity: start slower than feels right. Several experienced runners pointed out that it is completely fine to start at the back and refuse to let anyone else dictate your early pace. The race does not begin until the second half.

One of the more poetic warnings came from a runner who spent the first 20 miles “taking souls on the uphills,” then gradually lost steam and had his own soul taken right back by the people he’d passed. Ego is heavy. Leave it at the start line.

Walking is a Strategy, Not a Failure

A huge number of first-timers showed up believing they had to run the entire thing. They were wrong, and they paid for it.

One runner tried to run a technical section from mile 14 to 18, completely torched his legs and balance, and spent the final dozen miles falling and suffering. On his second 50K he walked what needed walking, ran what could be run, and finished stronger and faster.

The advice that kept surfacing: walk the steep hills, even early. If your goal is to finish rather than to podium, there is nothing wrong with power hiking the climbs. Plenty of seasoned ultrarunners do exactly that. Save your legs for the back quarter of the race where they actually matter.

The Aid Station Goldilocks Problem

Aid stations tripped people up in two opposite directions, and both cost real time.

On one side were the runners who blew straight through to save time, only to get passed by the people who briefly stopped. That short pause turned out to be a reset, not a delay. On the other side were the runners who treated the aid station like a rest stop, lingered too long, broke their rhythm, and watched their momentum evaporate.

The sweet spot, according to the people who figured it out: stop at every aid station, but do not dawdle. Refill all your bottles before you leave, grab your fuel, and eat on the way out rather than standing around. One runner learned to refill everything after a stretch of waterless miles taught him the hard way.

And the single most repeated piece of aid station wisdom, delivered with a laugh by more than one person: never sit in the chair. The moment you sit down, getting back up becomes a negotiation you will lose.

Fuel: Variety Keeps You Moving

Nutrition was where the stories got vivid, and occasionally gross.

The most common rookie error was relying on a single food and discovering that palate fatigue is real. One runner packed nothing but chocolate, watched it all melt, then could not stomach another bite. Another fueled entirely on sour patch kids and burned the inside of his mouth. The pineapple devotee ate it at every aid station for 50 miles until everything tasted spicy. Spicy cookies. Spicy coke. Spicy quesadillas.

Bring options, and lean on real food. Boiled potatoes dipped in salt came up again and again as a savior. Several marathoners new to ultras did not realize they were supposed to eat solid food at all, having only ever used gels.

Timing matters too. One veteran waited until mile 15 to try eating, inhaled five boiled potatoes and four brownie bites, took off running hard, and learned what happens next.

Eat early, eat steadily, and do not wait until you are starving to start.

Hydration and Electrolytes Will Sneak up on You

A few runners made the mistake of relying entirely on aid stations for water and carrying none of their own. The miles between stations were miserable.

Then there is the electrolyte trap. One heavy sweater drank 40 bottles of water by mile 25 and flushed out every electrolyte in his body. His fix was one salt pill an hour, and he hasn’t had a problem since. Pickle juice and electrolyte mixes earned their own shoutouts.

The takeaway is to carry your own water, refill it fully at every chance, and treat salt as seriously as you treat hydration.

Your Feet Will Make or Break the Day

The foot care confessions were brutal and unanimous.

Lost toenails, blood blisters, two weeks off running afterward. The recurring advice: wear toe socks, tape your toes before the start, and use anti-chafe balm anywhere skin rubs. One runner swore by simply changing shoes and socks halfway through and called it life-giving.

Chafing got its own warnings too, from the runner who forgot to apply Vaseline to the one who wore brand new leggings on race day, overheated, and chafed raw from the seams. Which leads to the next lesson.

Train for the Course You Are Actually Running

Plenty of regrets traced straight back to training that did not match the race.

The Florida runner who signed up for a mountain 50K trained on treadmills, bridges, and stairs, then got destroyed by relentless rocky descents and missed a cutoff by 12 minutes. His verdict: train on terrain that mimics your race terrain. Hill training, vertical gain, and downhill practice all came up repeatedly, because the climbs wreck your lungs and the descents wreck your quads.

Other training gaps people regretted: skipping cross training and strength work, having a longest training run of only 9 or 10 miles, and not maintaining a consistent aerobic base year round. One runner now keeps 25 to 30 miles a week even in the off season so each training block is an adjustment rather than a shock.

The Night Before Matters More Than You Think

This is where the funniest and most relatable mistakes lived.

Drinking the night before was a popular regret, with one runner estimating his hangover cost him a full hour. Another drank two cases of beer and slept two hours. Several drove five hours, slept in a car, then drove five hours home immediately after finishing.

And the unbeatable champion of bad timing: the runner who, the night before a 55 miler, decided to rescue a kitten. The advice writes itself.

The boring but reliable lessons here are real. Sleep, lay off the alcohol, sort out your gear, and yes, use the bathroom before the gun goes off. More than one runner listed that last one as a genuine race-day regret.

The Mental Game is the Whole Game

Underneath the gear and fueling tips ran a quieter, more important theme.

Runners regretted letting someone else’s pace become their own and had to learn it was okay to pass. They regretted caring too much about their finish time on a day that was supposed to be about finishing at all. One runner who DNF’d admitted she could have hiked the final loops and finished, but her pride and her own head got in the way. Her message: when you feel like quitting and it is safe to continue, keep going. Walk, hike, crawl, but do not quit.

The most repeated piece of advice in the entire thread was also the simplest. Run your own race, and have fun. A few runners even regretted not pausing to take in stunning scenery, or skipping the post-race beer with the old timers. The finish line is the goal, but the experience is the point.

The Stuff Nobody Warns You About

A few hard-won lessons defy categories and deserve their own honorable mention.

Watch your watch battery, because one runner’s died at mile 28 of his first 50K. Know the route so you do not add bonus miles by going the wrong way. Do not trust that a 50K is exactly 50K, since one turned out to be closer to 55 and forced a frantic sprint to beat the cutoff.

And finally, a genuine public service announcement from the trail: if the runners ahead of you suddenly start screaming, they are being stung by bees. One runner got stung in the mouth by a wasp resting in his flat coke. He finished anyway.

A 50K Cheat Sheet, in one breath

Almost every mistake on this list shares a single root cause, which is treating a 50K ultramarathon like a longer version of a race you already know. It is not.

Start slower than your ego wants. Walk the hills. Stop at aid stations without living in them. Carry your water, take in enough water, vary your food, and protect your feet. Train the terrain you will actually face, sleep the night before, and run the race in front of you instead of the one happening around you.

Do that, and your first 50K becomes the one you finish smiling, not the one you spend the next decade laughing about.

Source: https://www.facebook.com/groups/733469537024027/permalink/2724014151302879/