C2K — Couch to 5K & 10K

C2K is an offline running trainer that guides you from the couch to running 5K, 10K, and beyond. Follow a clear plan, hear hands-free coaching, and keep your progress private — with no ads and no tracking.

Programs:

• Pre-C25K — 3-week gentle starter for absolute beginners

• Couch to 5K (C25K) — 9-week program, 3 runs per week

• Bridge to 10K (B210K) — 6-week bridge for C25K graduates

• Couch to 10K (C210K) — 14-week program, continues from C25K

• One Hour Runner — 13-week progression from 30 to 60 minutes continuous running

• 5K Improver — 8-week speed and stamina program for runners who can already complete 5K

Features:

• Audible voice prompts — "Start running", "Walk for 90 seconds", countdown warnings

• Customizable coaching — adjust voice speed/volume, countdown warning timing, and mid-interval cues

• Test voice playback before a workout, with Android text-to-speech diagnostics

• Vibration cues as an alternative or addition to voice

• Tones mode — short chimes instead of a voice for interval changes and countdowns

• Adjustable vibration strength and language selection

• Background workout timer — continues with screen off

• GPS tracking (optional) — records distance and pace; works without GPS too

• Treadmill mode — indoor runs without GPS

• Skip the warm-up or cool-down — in Settings, or with one tap during a workout

• Workout history — session log with total distance, time, best pace, longest run, and calorie estimates

• Progress tracking — remembers which weeks and days you've completed, with the option to reset

• In-app running guide — FAQ covering pacing, gear, and terminology

• Available in 8 languages — English, German, Spanish, French, Galician, Portuguese (Brazil), Russian, Turkish

• Works offline — no internet permission required

• No proprietary services required — compatible with GrapheneOS and privacy-focused devices