The heart-rate zones, field tests and base plans behind the calculators on this site, in one book.
Find your heart rate zones, build an aerobic base with 8- and 12-week plans, and use pace and power tables to train easy and race faster. Inside: zone tables by age, max HR, heart rate reserve (Karvonen) and LTHR, field tests for max HR, LTHR and FTP, four ways to verify Zone 2 without trusting your watch, and complete base plans for running and for cycling.
The four pieces of gear our calculators reference most: a watch that tracks every zone, a trainer for structured workouts, the chest strap that makes heart-rate math accurate, and a race-day shoe.
As an Amazon Associate we earn from qualifying purchases. Prices are approximate and change often.
Garmin Forerunner 265
AMOLED training watch with pace, training zones, and VO2 max estimates built in.
~$380
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Wahoo KICKR Core 2
Smart trainer with Zwift Cog. Controlled power for the indoor intervals our cycling plans call for.
~$550
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Polar H10
The gold-standard chest strap. Makes every heart-rate zone calculator on this site more accurate.
~$105
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Nike Alphafly 3
Carbon-plate marathon racer. The shoe to pair with the race times you plan here.
~$177
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Science-backed periodized programs based on Jack Daniels, Joe Friel, and 80/20 methodology. Export directly to your calendar.
Answer a few quick questions and get personalized equipment recommendations matched to your goals and budget.
5 questions to find the right indoor bike for your goals.
Take the Quiz π6 questions to match you with the best treadmill.
Take the Quiz π£6 questions to find the right rower for you.
Take the Quiz ποΈ6 questions to build your ideal rack setup.
Take the QuizSkip the research rabbit hole. Four complete kits with real products and prices: Beginner Runner, Triathlon Race Day, Bike Commuter, and Hyrox Training.
Gifts for runners, cyclists and triathletes, ordered from the big gift down to stocking stuffers, plus a gift finder that matches the gift to their training level.
25+ free tools to optimize every aspect of your training
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. Generating plans and calendar (.ics) export are free for everyone, with no signup. PDF, Excel/CSV, saved plans and share links are part of Premium, a $12 one-time unlock.
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.