Race Build-up Routine
Following the order of Race Prediction → Lactate Threshold → Zone 2 Calculation allows you to design a realistic target pace and weekly training intensity simultaneously.
All-in-one Running Toolkit
We've linked the running calculators and training guides you need to dedicated pages.
From race prediction, Zone 2 heart rate, treadmill conversion, to lactate threshold calculators. Plus, find in-depth guides and gear recommendations below!
Riegel·MAF·Karvonen
Utilize proven formulas and data-driven calculations in one place.
CSV·Lap Time·80/20
Support your target race with practical tools and training structure tips.
Domestic & International Races
We provide schedule updates from major domestic races to big international ones.
Core Calculators & Tools
Open dedicated pages for race prediction, Zone 2 heart rate, treadmill conversion, and lactate threshold calculators to check all the data you need.
Calculator
🏁 Race Prediction
Enter your recent record to generate a target pace and split chart based on the Riegel formula, with guidance on altitude/temperature correction and fueling strategy.
Calculator💓 Heart Rate Zones
Enter your age and resting heart rate to instantly calculate Zone 1-5, MAF, and Karvonen results, and get recommendations for weekly training volume.
Converter🧮 Treadmill Conversion
Cross-convert between km/h·mph and min/km·min/mile, and simultaneously check your 400m lap time and interval·LSD pace ranges.
Calculator🔥 Lactate Threshold
Enter your field test or race data to calculate your LT pace and heart rate, and receive recommendations for tempo·cruise sessions and training tips.
Running Resources Hub
We've organized running theories and gear information in a card format to help you connect the numbers from the calculators to your actual training.
📚 Running Guides
Explore key theories and practical tips in a card format, from Zone 2 strategy to tempo·interval·recovery checklists and 80/20 weekly structure.
🛍️ Gear Recommendations
We help you build your own running setup by organizing running shoes, wearables, and fueling items by level.
🗓️ Marathon Schedule
We've summarized registration schedules and travel tips for major domestic races, regional half marathons, trail races, and major overseas races at a glance.
Use Calculators and Guides Together
By combining calculators and guides according to your race preparation stage, you can design realistic goals and weekly training intensity at the same time.
Running Guide Combo
Check the tempo, LSD, and interval cards and the recovery checklist on the Running Guides page, and prepare the necessary running shoes and fueling items on the Gear Recommendations page.
Preview the 2025 Marathon Calendar
We sequentially update not only major domestic races but also regional half marathons, trail races, and major overseas race schedules.
Spring Season
We've summarized the registration periods for races from March to May, including the Seoul International, Daegu, Gyeonggi Gwangju, Busan Half, and Donghae Uljin.
Fall Highlights
In addition to Chuncheon, Busan, and JTBC, it includes various full and half marathons such as Gongju Baekje, Gyeongju International, Cheongju, and Gwangju Namdo International.
Trail & Overseas Expeditions
Information on major overseas races like UTMF, OCC, Seoul 100K, Boston, Berlin, and Sydney is also organized to help you plan your trip.
Frequently Asked Questions
We summarize frequently requested usage methods and access paths to help you get started quickly.
Where can I use the race prediction calculator?
Open the "Race Predictor" page from the top navigation to use the recent record-based prediction calculator and split chart right away.
How do I calculate my Zone 2 heart rate?
On the "Heart Rate Zones" page, enter your age and resting heart rate and select the % Max HR or Karvonen method to instantly calculate your Zone 1-5 and MAF results.
Where can I convert treadmill speed?
On the "Treadmill Converter" page, you can cross-convert between km/h, mph, min/km, and min/mile, and check your 400m lap time and training pace range together.
What do the Running Guide and Knowledge Hub offer?
The Running Guide page provides key training theories and practical tips in a card format, including tempo, LSD, interval, recovery strategies, and 80/20 weekly structure.
Start your own running build-up now
Connect the race predictor, lactate threshold, and Zone 2 calculators, and prepare for your target race with running guides and gear recommendations.