Pheidi is a free running training plan generator for 5K through marathon distances. Instead of a one-size-fits-all template, it builds a personalized, science-backed plan around your goal race, weekly schedule, experience level, and injury history.

Its standout feature is adaptability: when real life gets in the way, the plan adjusts. Reschedule a workout, log an injury, or take a rest week, and Pheidi automatically reworks the sessions that follow so your plan stays coherent instead of falling apart. The result is meant to feel like a knowledgeable coach in your corner rather than a static PDF you have to force your week around.

Pheidi runs in your browser, works for runners of every level, and is 100% free.