Every mile
begins with
a single step.

C25K has guided 5 million people to their first finish line.

Begin Your Journey

5M+ Runners
4.8 ★ Rating
Free to Start

Training Programs

Choose your
distance.

01

C25K® 5K Trainer

The world's most-trusted couch-to-running plan. Walk-to-run intervals designed for absolute beginners.

8 weeks · 3 runs/week Free
02

10K Trainer

Bridge from your first 5K to the classic 10K distance with progressive endurance training.

10 weeks · 3 runs/week Pro
03

Half Marathon

13.1 miles — a milestone that changes how you see yourself. Structured long-run and tempo sessions.

12 weeks · 4 runs/week Pro
04

Marathon

26.2 miles of earned ground. A complete 18-week build with peak weeks, tapers, and race-day strategy.

18 weeks · 4 runs/week Pro

"The finish line is just the beginning of a whole new race."

Zen Labs — Built for runners who are still becoming runners

Real Stories

I started C25K unable to run to the end of my street without stopping. Eight weeks later I crossed a 5K finish line in tears. This app didn't just change my fitness — it changed who I believe I am.

★★★★★

Margaret T.

Age 52 · Completed C25K
Burlington, Vermont

★★★★★

I've tried other apps but always gave up. C25K's coaching voice felt like a real running partner. Three months later, I'm signed up for my first 10K.

James R.

Age 38 · Completed C25K & 10K

★★★★★

After my second kid I thought I'd never run again. Started Week 1 with zero confidence. The graduated intervals make it feel achievable every single session.

Every milebegins witha single step.

Choose yourdistance.

Start for free.Finish proud.

Every mile
begins with
a single step.

Choose your
distance.

Start for free.
Finish proud.