C2K — Couch to 5K & 10K
Unleash Your Inner Runner
• Imagine transforming from the couch to conquering 5K, 10K, and beyond.
• C2K is your dedicated, offline running coach, designed to guide you every step of the way—privately, powerfully, and completely free from distractions.
• Embrace a clearer path to fitness without ads or intrusive tracking, just pure progress.
Your Personalized Path to Running Success:
Embark on a journey perfectly suited to your current fitness level with C2K's diverse and progressive programs:
• Pre-C25K (3 weeks): A gentle starting point for absolute beginners to build fundamental fitness.
• Couch to 5K (9 weeks): The classic program to confidently complete your first 5K.
• Bridge to 10K (6 weeks): Seamlessly transition from 5K to 10K after graduation.
• Couch to 10K (14 weeks): A comprehensive journey from beginner to completing a 10K.
• One Hour Runner (13 weeks): Gradually build your endurance from 30 to 60 minutes of continuous running.
• 5K Improver (8 weeks): Enhance your speed and stamina once you can comfortably run 5K.
Empowering Features for an Uninterrupted Run:
C2K provides all the tools you need for an optimized and focused workout experience:
• Hands-Free Coaching: Benefit from clear, audible voice prompts, including countdown warnings and customizable cues for speed and volume.
• Discreet Guidance: Opt for vibration alerts as an alternative or alongside voice prompts, with adjustable strength.
• Flexible Progress Tracking: Optionally log your distance and pace with GPS, or utilize treadmill mode for indoor workouts. Review your comprehensive workout history and monitor your overall progress.
• Seamless Operation: Your workout timer continues in the background, even with the screen off. No internet connection is required, allowing you to run truly offline, anywhere.
• Privacy-First Design: Enjoy C2K without proprietary services, ensuring compatibility with privacy-focused devices and complete freedom from ads or user tracking.
• Comprehensive Support: Access an in-app running guide covering pacing, gear, and terminology.
• Global Accessibility: Available in 8 languages, breaking down barriers to fitness worldwide.
Built on Trust and Transparency:
• C2K is free software released under the GNU General Public License v3, reflecting a commitment to openness and user control.
• Necessary permissions are thoughtfully implemented to enhance your experience:
+ Background Timer: Keeps your session active even when your screen is off.
+ Optional GPS: For precise distance and pace tracking, which you control.
+ Notifications & Vibrations: To deliver timely workout cues and controls.
FAQ
Q: Who is C2K designed for? Is it only for people new to running?
A: C2K caters to a broad spectrum of individuals! While it's perfect for absolute beginners with its Pre-C25K and Couch to 5K programs, it also offers programs for those who can already run, such as Bridge to 10K, Couch to 10K, One Hour Runner, and 5K Improver, helping you build endurance and enhance your speed.
Q: What specific running programs does C2K offer?
A: C2K provides a diverse range of progressive programs: Pre-C25K (3 weeks) for absolute beginners, the classic Couch to 5K (9 weeks), Bridge to 10K (6 weeks) to transition from 5K, a comprehensive Couch to 10K (14 weeks) starting from scratch, One Hour Runner (13 weeks) to build continuous running time, and 5K Improver (8 weeks) to enhance speed and stamina once you can comfortably run 5K.
Q: How does C2K provide coaching during a run?
A: C2K offers hands-free coaching through clear, audible voice prompts, which include countdown warnings and customizable cues for speed and volume. If you prefer a more discreet experience, you can opt for vibration alerts as an alternative or alongside voice prompts, with adjustable strength.
Version History
v1.2.18——14 Sep 2026
Open-source C25K/C210K running trainer. No ads, no tracking. Download the latest version of C2K — Couch to 5K & 10K 1.2.15 to enjoy new features and updates immediately!
*1.2.18
• Fixed a rare crash on Android 10 and older devices that could happen when location services were turned on or off during a workout.
*1.2.17
• Added manual language selection with locale-aware workout notifications and voice announcements.
• Added a voice test and actionable text-to-speech diagnostics in Settings.
• Added contributor credit for the language-selection contribution.
*1.2.16
• Added configurable vibration strength with Light, Medium, and Strong presets.
