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The 5 Hardest Physical Challenges I've Ever Done

The short answer

Counting down: 5. 29029 Everesting, 4. Ultraman Arizona, 3. the Tahoe 200, 2. the Bigfoot 200 and 1. a half marathon on a treadmill every day for 153 days. The races hurt more in the moment, but nothing tested me like showing up to the same treadmill for five months.

I've finished seven 100-milers and three 200-milers, and I've done some things that weren't races at all. These are the five that pushed me the hardest, counting down to number one.

At a glance

#ChallengeWhenWhat it wasMy result
529029 EverestingAug 202129,029 ft of climbing at Snowbasin, Utah1st place, ~17 hours
4Ultraman Arizona20236.2 mi swim, 261.4 mi bike, 52.4 mi run over 3 days4th place
3Tahoe 200Jul 2023My first 200-mile race86:58
2Bigfoot 200Aug 2023200+ miles, 17 days after Tahoe79:54
1Treadmill half marathonsMar–Aug 2025A half marathon every day for 153 daysGuinness World Record

5. 29029 Everesting

Pierce Showe smiling and pointing to the Everest row on the 29029 ascent board at Snowbasin
Pointing to the Everest line on the 29029 ascent board: 13 trips up.

A company rents out a mountain, and you hike the vertical equivalent of Mount Everest. You hike up, take the gondola down and do it again, loop after loop. I think I went up 13 times.

This one was extremely hard because I'd never climbed that amount of vertical gain. I took first, which was awesome, but the event is really more about how you challenge yourself than finishing first.

It was probably one of the most fun fitness events I've ever been to, because of the atmosphere and how everyone supports each other. I rode the gondola down with different people after every loop, and it was super fun.

4. Ultraman Arizona

Pierce Showe running under the Ultraman Arizona finish arch
Finishing Ultraman Arizona in 2023.

This race actually doesn't exist anymore, but it was a fun one. It's basically a double Ironman over the course of three days. It was extremely challenging, but very fun.

I had been running a ton before then, so getting to switch up the disciplines was what I liked about it. You also cover so much distance that it was cool to see different parts of Phoenix.

Coming back three days in a row to do crazy efforts was wild. I had never done a multi-day event like that, and this was before I did the 200s. And swimming for four hours straight was so wild. I was so discombobulated getting out of the water that I almost stumbled and fell.

3. Tahoe 200

Pierce Showe sitting in a chair at night eating a quesadilla during the Tahoe 200
Refueling with a quesadilla at night during the Tahoe 200.

The Tahoe 200 was my first 200-mile race, and I didn't know what I was in for. Honestly, I was a little cocky going into it and didn't respect the distance.

I was so excited that I forgot to put on chafing ointment before the start, and I got crazy bad chafing. Then about 30 to 40 miles in, I got really bad diarrhea, which made the chafing even worse.

I wanted to quit several times and almost did. My crew helped me problem-solve it, got me to take Imodium, and talked me into continuing instead of quitting. Thanks to them, I finished in 86 hours and 58 minutes.

2. Bigfoot 200

Pierce Showe bent over at the finish line of the Bigfoot 200
All I had left at the finish of the Bigfoot 200.

I finished Tahoe, and 17 days later I was on the start line of Bigfoot. I basically had no time to recover, and this race has crazy amounts of elevation gain.

There's no way I should have been able to run that race well. But I finished about 7 hours faster than Tahoe, on a harder course, with only one crew member and no pacer.

It was a big turning point for me in the power of the mind.

1. A half marathon on a treadmill every day for 153 days

Pierce Showe holding his Guinness World Records certificate in a gym next to a treadmill
The Guinness World Records certificate: 153 consecutive days of a half marathon on a treadmill.

It was absolutely wild doing that for so many days in a row. After about two to three weeks, my body could handle it pretty regularly. I was still tired and worn out throughout the days, but it wasn't that much harder. I just got used to it.

What made it difficult: three different times, I got all the way done with my run and realized my camera was out. I needed the footage for the record, so I had to redo the whole run from the start. Three other times, I had to get off the treadmill to go to the bathroom, so I had to rerun it again.

The hardest part wasn't even the physical side. It was the mental side of doing it every day for five months.

Why this is number one: a lot of the other challenges on this list were harder or hurt more in the moment. But this one was just so long. It required me to be present, not travel, and be at the same treadmill every day for around two hours.

It required two witnesses to be there every day, and sometimes the witnesses canceled. It required me to run the whole half marathon twice in one day on three different occasions when I had camera issues, and to run more miles than necessary when I had bathroom issues on the treadmill. That is why this was the hardest.

Want more? Here are the 10 hardest endurance races in the world, including the Triple Crown of 200s and Ultraman, and my bucket list 100-mile races.

What's the hardest thing you've ever done?

Comment it on my latest post on Instagram. I want to hear it.

Find me @pierceshowe

Common questions

What is 29029 Everesting?

A company rents out a mountain, and you hike up and ride the gondola down, over and over, until you've climbed 29,029 feet, the height of Mount Everest. At Snowbasin in Utah, that's about 13 trips up.

How long is Ultraman?

Ultraman is three days: a 6.2-mile swim and a 90-mile bike on Day 1, a 171.4-mile bike on Day 2 and a 52.4-mile double marathon on Day 3. It's basically a double Ironman spread over three days.

How long does it take to run the Tahoe 200?

I finished the 2023 Tahoe 200, my first 200-mile race, in 86 hours, 58 minutes.

How long does it take to run the Bigfoot 200?

I finished the 2023 Bigfoot 200 in 79 hours, 54 minutes, about 7 hours faster than my Tahoe 200, just 17 days after finishing Tahoe.

Nothing in this article is medical advice. Consult your doctor before beginning any training program.