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FREE Always

🌲 Mill Valley, CA · Every Sunday · Free

MARIN MILES RUN CLUB · GRADES 6 · 7 · 8

Created by Kasper Karbe & Jackson Chen

A free trail running club built by two 9th graders — Kasper and Jackson — to help middle schoolers fall in love with running and prepare for the road ahead.

100%

Free, Always

Every

Sunday 9–11 AM

Grades

6 · 7 · 8

All

Ability Levels Welcome

Our Story

Started by Runners,
For Runners

We're Kasper and Jackson — two 9th graders from Mill Valley who both ran in middle school and honestly felt kind of lost when high school came around. The jump from a casual middle school team to a real competitive program is bigger than people think.

We started Marin Miles because we wished something like this had existed for us. Every Sunday we take 6th, 7th, and 8th graders out on the trails, run with them, and help them actually get better — not just go through the motions.

Whether you've never raced before or you're already on your school's team, you're welcome here. No cost, no pressure.

Founded by Kasper & Jackson, 9th grade

We know firsthand the beauty of running and also the complications that come with it. We're here to help you navigate and find the true meaning of running.

— The Founders, Marin Miles

Programs

What We Actually Work On

🎯

Pacing & Form

Learn how to run smarter, not just harder. We work on stride efficiency, breathing, and learning your own pace — skills that pay off in races and in life.

🏁

Race Prep

Cross country, track, mile runs — we help you understand race strategy, warm-up routines, and how to push through the hard parts of a race.

📈

Building Your Base

Whether you're just starting out or already on your school's team, we help you build consistent mileage and a training foundation that lasts.

🎓

High School Prep

We walk 8th graders through what to expect in high school running — tryouts, training volume, mental prep, and how to stand out on day one.

Who We Serve

Who We
Help

For Students (Grades 6–8)

You want to get faster but don't know where to start
You're on your school's running team and want extra reps
You're heading to high school and want a head start
You just love running and want community around it
You've never run competitively but you're curious

For Parents

Your kid wants athletic activity they'll actually enjoy
You want a structured, supervised weekend activity
You're looking for free, quality enrichment programs
Your child wants to make the high school team one day
You want your kid to find a community that motivates them

When We Meet

Every Sunday.
9 AM – 11 AM.

Every Sunday

Free

9:00 AM

Meet up, warm-up stretches & drills

9:20 AM

Group run (distances by level)

10:20 AM

Cool down, form work & tips

10:40 AM

Stretch, strength basics & Q&A

11:00 AM

Wrap-up — see you next Sunday!

📍 Where We Meet

Every Sunday, 9:00–11:00 AM somewhere on the trails of Mill Valley, CA. We switch up the starting spot each week to keep things interesting — every location is a manageable, close distance from Mill Valley and MLK. You'll get the exact location in your confirmation email after signing up — always easy to reach from Mill Valley and MLK Middle School.

Trail or running shoes
Water bottle
Layers — Marin mornings can be cold
Sign-up required before your first run
Parents can absolutely come and watch
First time? We'll make sure you're taken care of

💛 Need gear? If cost or gear is a barrier for your child, reach out to Kasper or Jackson — we'll make sure it's not a barrier.

Runner's First Name *

Runner's Last Name *

Grade *

Date of Birth *

Parent/Guardian Name *

Relationship *

Parent Email *

Parent Phone *

Emergency Contact Name *

Emergency Contact Phone *

Medical Conditions / Allergies

⚠️ Liability Waiver & Assumption of Risk

By signing up for Marin Miles ("the Club"), the undersigned parent or legal guardian acknowledges and agrees to the following:

1. Assumption of Risk. Participation in running and trail activities involves inherent risks, including but not limited to physical injury, sprains, falls, and other accidents. I voluntarily assume all such risks on behalf of my child.

2. Release of Liability. I hereby release, waive, and discharge the organizers of Marin Miles, including Kasper Karbe and Jackson Chen, from any and all liability, claims, demands, or causes of action arising out of or related to any loss, damage, or injury that may be sustained by my child during participation in Club activities.

3. Medical Authorization. In the event of an emergency in which I cannot be reached, I authorize the Club organizers to seek emergency medical assistance for my child. I accept full financial responsibility for any medical treatment rendered.

4. Photo & Media Consent. I grant permission for my child's image to be used in Club-related materials, including social media posts, unless I opt out in writing via email.

5. Rules & Conduct. I agree that my child will follow all instructions given by Club organizers, behave respectfully, and understand that participation may be revoked for unsafe or disruptive behavior.

6. Independent Activity. I understand that Marin Miles is a volunteer youth program organized by student athletes, not a licensed coaching organization, school program, or formally incorporated entity.

I have read, understood, and agree to the Liability Waiver and Assumption of Risk above on behalf of my child. I confirm I am the parent or legal guardian. *

I confirm that all information provided is accurate and that my child is in suitable physical condition to participate in running activities. *

Your information is used only to contact you about Marin Miles sessions and for safety purposes.

Why You Need to Sign Up First

🏥

Trails aren't a track. People can actually get hurt out there. We need your emergency contact and any medical info before we head out — just in case.

📋

The waiver is real. We're minors running an unofficial club on public trails. The waiver protects us and makes sure parents actually understand what they're signing their kid up for.

📍

Location changes weekly. We explore different trails every Sunday — you'll get that week's meeting spot by email after you register.

👟

We plan ahead. Knowing who's coming helps us set up the right pace groups so nobody ends up running alone or stuck at the wrong speed.

What It's Actually Like

We show up, we warm up, we run. Kasper and Jackson are out there with you the whole time — we're not just standing around telling people what to do. Runs are grouped by pace so you're always with people at your level.

The trails around Marin are genuinely awesome. It doesn't feel like practice — it feels like an adventure with some structure to it.

Support the Mission

Give Back to
Running.

Marin Miles is and always will be completely free to attend. Kasper and Jackson volunteer their time because they believe in what this club stands for — no strings attached.

If you'd like to give back, 100% of donations go directly to a running-related nonprofit supporting youth athletes who lack access to training, gear, and race opportunities. We're still selecting our partner charity — we'll announce it here soon.

Donations are entirely optional. Signing up and showing up is all we ask. 💛

Our commitment: Not a single dollar of donations goes to the founders or the club. Every contribution goes to young runners who need it most. We'll post updates on where donations go.

🔍 Charity partner coming soon

We're vetting youth running nonprofits to make sure every dollar reaches athletes directly. Have a suggestion? Email us.

How to Donate

Once we announce our charity partner, we'll link directly to their donation page. In the meantime, reach out to us directly and we'll point you in the right direction.

💸 Donate via Venmo @Jackson-Chen-32 📧 Email Kasper 📧 Email Jackson

☕ Tips are always welcome. We put a lot of time into planning routes, showing up every Sunday, and making sure every kid has a good experience. If you'd like to show appreciation, even a small tip via Venmo means a lot — but truly, no pressure at all.

🏅

Youth Running Nonprofits

Partner charity announcement coming soon

💯

100% to Charity

Zero goes to the club or founders

For Parents & Guardians

We Know You Have
Questions

We get it — two 9th graders running a club for your kid sounds unusual. We're not going to pretend it isn't. But here's the truth: we run alongside everyone the entire session, we plan every route in advance, and parents are always welcome to join and watch. We started this because we genuinely wanted to help — full stop.

We started this because we both went through middle school running and felt like there was nobody helping us get ready for high school. We just wanted to fix that for the kids coming up behind us.

Is it really free?

Yep, completely free. No fees, no gear requirements, no catch. We just want kids to run.

Does my child need to sign up?

Yes — registration and a parent-signed waiver are required before your kid's first run. It's quick to fill out and helps us keep everyone safe. Sign up above.

Who's actually running this?

Us — Kasper Karbe and Jackson Chen, two 9th graders from Mill Valley. We're both on our school's running team and we run alongside everyone the whole session. No one gets left on their own.

Where do runs happen?

Mill Valley, CA. We rotate the starting spot each Sunday to explore different trails around Marin. After you sign up, we'll email you that week's location.

What if my kid has never run before?

That's totally fine — actually, great. We group by pace so nobody feels left behind. Beginners are super welcome.

Why We Started This

🏃 We both felt lost going from middle school running to the high school team. We wanted to bridge that gap for other kids.
🌲 Marin has incredible trails — we wanted to share that with younger runners who might not know where to start.
🤝 Running with people your own age is way more fun and way more motivating than running alone.
🆓 We didn't want cost to be a reason someone couldn't join. So we made it free, full stop.
📧 Questions? Email us directly — Kasper or Jackson. We actually respond.

Safety: We run on open Marin trails. Parents are always welcome to join or watch. Sign-up and waiver required before the first session.

Who We Are

Meet Kasper & Jackson

📧 kasper.karbe@gmail.com

Kasper Karbe

Co-Founder · 9th Grade · Mill Valley

I've lived in Marin my whole life and the trails here are what made me fall in love with running. In middle school I never felt like I was running enough, and when high school cross country hit I got overwhelmed and ended up injured. I started Marin Miles for anyone who wants to build on what they're already doing, get a real head start on high school, or just give running a shot — and I'm genuinely excited to help.

Experience

🏃

XC & Track

All 3 years of middle school XC & track · Tam High XC & track team

🏅

Dipsea Race

3 finishes · 1st in age group 2 years in a row · 141st out of 2,000 · 1:05 finish time

🌲

Run Clubs

Tamalpa Runners · Pinnacle Run Club

🥇

Middle School Racing

Multiple XC & track wins throughout middle school

Jackson Chen

Co-Founder · 9th Grade · Mill Valley

Running has been a huge part of my life and I wanted to share that with younger kids in the area. Kasper and I came up with Marin Miles because we both felt like there was a gap nobody was filling. I co-lead the runs and help make sure everyone's comfortable with the pace.

Experience

🏃

XC & Track

Running throughout middle school & high school · Tam High XC & track

🏅

MCAL Championships

4th place JV — freshman year

🌲

Run Clubs

Dipsea Kids

📧 jacksontchen11@gmail.com

MARIN MILES

Ready to Run?

No fees. No tryouts. No experience needed. Just a kid who wants to run.

MARIN MILES RUN CLUB · GRADES 6 · 7 · 8

Started by Runners,For Runners

What We Actually Work On

Who WeHelp

Every Sunday.9 AM – 11 AM.