Science-backed periodized programs based on Jack Daniels, Joe Friel, and 80/20 methodology. Export directly to your calendar.
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Why athletes choose us
Every calculator is built on peer-reviewed research and validated methodologies. No accounts required, no hidden feesβjust accurate tools for serious athletes.
Yes! Calendar (.ics) export is completely free with no signup. PDF and spreadsheet exports are available with a free email signup.
Our plans incorporate principles from Jack Daniels, Joe Friel, 80/20 Endurance, and proven ultramarathon coaching methodologies.
You can set your experience level, weekly availability, race date, and preferred long workout day. Export to spreadsheet for full customization.
All calculators use peer-reviewed formulas and established sports science. We cite sources and explain methodology for full transparency.
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