No food. No rest. Just movement. That was the mission Nick Bare, hybrid athlete and founder of Bare Performance Nutrition, set out to complete. His challenge? Burn 10,000 calories in a single day — entirely fasted — using nothing but grit, a smartwatch, and Austin’s trails, roads, and gym floors.
“This was about pushing limits,” Bare said. “It was about testing physical endurance, mental fortitude, and embracing discomfort.”
While he didn’t hit his calorie target, the challenge provided a raw look into what extreme exertion without fuel actually looks like. Over 12 hours, Bare ran, hiked, and lifted his way through an experience he said felt exactly like his days at Ranger School. By the end of the day, he had burned just over 5,000 calories, dropped over 7 pounds, and endured mental fog, low blood sugar, and physical exhaustion — all while never eating a bite.
Jump to:
- A Fasted Challenge Fueled by Discipline
- Morning Kickoff: A 7.7-Mile Run Along Lady Bird Lake
- Mid-Morning Murph: Embracing the Suck
- Staying Hydrated — But Still Fasted
- Trail Running the Austin Greenbelt
- Second Long Run: Hitting the Wall
- Evening Workout: A Caffeinated Final Push
- Post-Challenge Reflections: The Weight Drop, The Reality Check
- Why Push So Hard Without Food?
A Fasted Challenge Fueled by Discipline
The rules were simple: burn 10,000 calories from movement, consume zero food, and track it all via smartwatch. Bare started the challenge at 8:00 a.m. in downtown Austin with a baseline calorie burn of 323 and a body weight of 217.6 pounds.
“The only fuel I had was discipline,” he said. “That was the whole point — to strip everything down and see what was left when it got hard.”
Morning Kickoff: A 7.7-Mile Run Along Lady Bird Lake
The first leg of the challenge took Bare through the scenic trails of Lady Bird Lake and Zilker Park — a slow-paced, 7.7-mile run designed to conserve energy.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
“I usually run at a 7:30 pace, but today I slowed it down. This wasn’t about speed,” he explained.
By the end of the run, Bare had already burned over 1,000 calories, with his watch showing 182 calories per mile. Despite a light drizzle and unfamiliar paths, he kept moving — counting cadence in his head and reminiscing about ROTC runs.
“My hats get drenched in sweat daily. I have to wash them weekly because they just reek,” he joked.
Mid-Morning Murph: Embracing the Suck
After the initial run, Bare pivoted to one of the toughest CrossFit-style hero workouts: The Murph.
This included:
- 1-mile run
- 100 pull-ups
- 200 push-ups
- 300 air squats
- Another 1-mile run (with a weighted plate carrier)
He tackled the calisthenics on wet concrete, slipping during push-ups and struggling to find grip during pull-ups. “It’s hard to do push-ups when the floor’s slick and your arms are shot,” he said.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
By the time he finished the Murph, his total calories burned had jumped to 2,100 — and it was still just before noon.
When asked why he was putting himself through it, Bare simply said:
“You’ve got to embrace the suck sometimes. You just have to.”
Staying Hydrated — But Still Fasted
Despite the no-food rule, hydration was non-negotiable. After sweating profusely during the run and Murph, Bare stopped by Walgreens to pick up zero-calorie vitamin water to replenish electrolytes.
“I almost got a Gatorade, but they didn’t have any,” he said. “I needed something — I was drenched.”
By mid-day, he was already feeling the effects of fasting, noting signs of lightheadedness and depletion, yet he pushed forward.
Trail Running the Austin Greenbelt
Bare shifted gears for a trail run through the Austin Greenbelt — turning what was meant to be a hike into another calorie-burning session. The terrain included rolling hills, quiet wooded paths, and a 7-mile route filled with sharp turns and elevation changes.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
“There was a moment out there where I realized I hadn’t seen a single person in miles,” he recalled. “I could smell myself. It was rough.”
Tracking distance wasn’t the goal — it was burning energy. He ran 500 calories out on the trail, then turned back to match it.
“That mental clarity I thought I had… it wasn’t clarity. It was just fog from running on empty.”
Second Long Run: Hitting the Wall
Returning to downtown Austin, Bare began the second major run of the day — another 8 miles on tired legs and low blood sugar.
By now, he’d burned 3,500+ calories and logged over 17 total miles for the day.
But he was slowing down.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
“I’m sucking right now. I’m just going to stride this one out,” he said mid-run. “Blood sugar is low. Really low.”
The mental grind intensified. He described it as a flashback to Ranger School, carrying weight, sweating non-stop, and running on fumes.
“This was Florida phase all over again,” he said. “Wake up, move all day, no food, and see what’s left of you at the end.”
By 4 p.m., he’d burned around 4,500 calories. Still 5,500 short of the target.
Evening Workout: A Caffeinated Final Push
To squeeze out one final push, Bare hit the gym for a chest and back session, aiming to burn an additional 500 calories.
Fueled by green apple pre-workout, Bare trained with short rest periods, high volume, and max effort.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
“I tried this formula a year ago when we first sampled it,” he said. “It smells so good.”
Despite the boost from caffeine, his body was beyond spent. By the time he finished, he had burned just over 5,000 calories for the entire day — halfway to his goal.
Post-Challenge Reflections: The Weight Drop, The Reality Check
The final weigh-in showed a dramatic drop — from 217.6 pounds to just over 210.
Seven pounds lost in 12 hours.
“Obviously it’s mostly water and glycogen,” he explained. “It’ll come back quick, but it shows how much your body expends when you don’t fuel it.”
He admitted that while some people claim to burn 10,000 calories in a day, he questions the accuracy.
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
“Either this watch is way off, or some of those people are not being honest.”
Why Push So Hard Without Food?
Bare connected the motivation to his military roots. In the Army — particularly in Ranger School — discomfort, hunger, and exhaustion are everyday norms.
“Today felt exactly like Ranger School. That’s why I did this,” he said. “I wanted to revisit that feeling, to test myself again.”
Despite not hitting the target, Bare sees the day as a win.
“I didn’t make it to 10,000, but I pushed harder than most ever will — and that’s the point,” he said.
As he walked away from the gym, depleted and craving food, he had one final thought:
If you want something simple that actually works, this is one of the most effective tools I’ve used to build strength, conditioning, and endurance without needing a full gym setup.
- Full-body training with one weight using swings, squats, and presses
- Solid cast iron build that feels stable and lasts for years
- Comfortable grip that makes high-rep workouts easier to handle
“I hope people enjoyed seeing me hurt. I truly sucked today. I need a damn meal.”
