250K with Mrs. K Give

Marathon des Sables · April 2027

Running 250 kilometers across the Sahara in memory of my mom, and for the people who are still fighting.

Give Now Read the story

In memory of Sharon Gwendolyn Kosinski

Scroll

01The story

Hi, I’m Jonyull.

Black-and-white portrait of Jonyull Kosinski
Jonyull Kosinski

I’m a health and human performance coach on the Windward side of Oʻahu, and I’ve built my career around one idea: the body and mind can do far more than people think when they’re trained with a plan and with care.

In August 2024 I lost my mom, Sharon Gwendolyn Kosinski, to laryngeal cancer.

In April 2027 I’ll line up at the start of the Marathon des Sables: 250 kilometers across the Sahara Desert, self-supported, carrying everything I need on my back. I’m running it with her, and I’m raising money to support cancer rehabilitation care for people who are fighting for their strength and their agency.

Home

Kaʻaʻawa, Hawaiʻi

Work

Health & human performance coach

Who I coach

Athletes, youth, and high performers across diverse backgrounds

Running for

My mom, and cancer rehabilitation care

What I believe.

  1. Consistency with exercise can mitigate much of the dysfunction that leads to disease.

  2. Challenging things are far more worth doing when they’re done for someone other than yourself.

  3. Showing up in small increments, consistently, matters more than any single big day.

02Why I’m running

Sharon Gwendolyn Kosinski sipping a milkshake
Mom

Running with Mrs. K.

Sharon Gwendolyn Kosinski · Mom

My mom was, and still is, a superhero in our family. Not because of our loss of her to disease; because of her impact, her presence, and her ability to problem-solve anything in her path, for us and for herself.

She taught me how to stand up for myself, how to grow through pain points, and to never take no for an answer. The magic she created with her heart and soul lives on in my sisters and me.

I know she would be proud, and that’s why she’s running in the desert with me.

What this moment is for

This race is the hardest, most involved event I’ve ever signed up for, and I wanted the reason to be bigger than me. Every kilometer is for Sharon and for the families still in the middle of it.

Give in Sharon’s memory

03The race

Marathon des Sables

Sahara Desert, Morocco · April 2027

  1. ~250 km

    A multi-stage footrace across the Sahara Desert in Morocco.

  2. Self-supported

    Runners carry all their own food and gear. Everything I need, on my back.

  3. 110°F+

    Temperatures regularly top 110°F.

  4. 100+ km

    The longest stage, run through the night.

  5. The finish

    It’s widely considered one of the toughest footraces on Earth.

04The runner

Built for this.

I’ve spent my career studying and coaching human performance, including a year of research in cancer exercise rehabilitation. Here’s what I’m bringing to the start line.

VO₂ max · lab-tested

60.5mL/kg/min

99th percentile for age and sex. Tested September 21, 2026.

Body fat · DEXA scan

9.2%

DEXA body composition. Tested September 11, 2026.

Research

1yr

Exercise physiology in oncology, focused on cancer exercise rehabilitation.

Up next

  1. Honolulu Marathon Back on the start line again.
  2. Marathon des Sables 250 km across the Sahara, with Mrs. K.

Race résumé

36+ races & competitions

Approximate. There have been a lot of them.

  • 3Ironman 70.3
  • 3Marathons
  • 3Ultramarathons
  • 5GoRuck events, 6 to 48 hours
  • 10+5K to half marathon
  • 10+Obstacle races
  • 2Bodybuilding competitions

Education

  • MS, Sport Science: Sport PsychologyLock Haven University
  • BS, Athletic TrainingLock Haven University

Certifications & licensure

  • Certified Athletic TrainerBoard of Certification (BOC)
  • Certified Strength and Conditioning SpecialistNational Strength and Conditioning Association (NSCA)
  • Level 1 Certification (CCES-L1)University of Northern Colorado Cancer Rehabilitation Institute
  • State-licensed athletic trainerPennsylvania and Hawaiʻi

Professional experience

  • Founder, CCJ: Concierge Coaching by Jonyull, LLCA concierge coaching and human performance practice on Oʻahu, Hawaiʻi. Coaching and nutrition practitioner.
  • Graduate Assistant, Cancer Rehabilitation2017

05Race day

The clock is running.

The 250K · Marathon des Sables

Race underway. Follow along below.

Stage 1 · Sunday, April 4, 20277:00 AM Sahara time (estimated)

Up next · Honolulu Marathon

Race day in Honolulu.

Sunday, December 13, 20265:00 AM in Honolulu

Live tracking

Follow every checkpoint

Opens on race day

From the start of Stage 1, this panel follows Jonyull through the Sahara: his kilometer, last checkpoint, race time and overall rank, refreshed every minute from the official race tracker.

Bib number announced closer to race week.

See last year’s race on the official tracker

06How to give

Run the 250K with us.

Every gift supports cancer rehabilitation care for people who are fighting for their strength and their agency.

Every kilometer counts.

Give what feels right. No gift is too small.

Give on GoFundMe

Opens GoFundMe, where you choose your amount.

Where your gift goes

Every gift supports cancer rehabilitation care. This is a personal fundraiser, not a registered charity, so gifts are not tax-deductible. Gifts are one-time and flat; there’s nothing to pay after the race.

For companies

Interested in sponsoring the run? I’d love to talk. Because this is a personal fundraiser, corporate gifts generally aren’t tax-deductible.

Start a sponsorship conversation

07Follow along

Give on GoFundMe