This plan will take you from walking to running 13.1 miles in 20 weeks of gradual build-up. As it states in the name, ‘Couch to Half Marathon,’ no prior training is needed. This the mother of beginner training plans. Convert 20 mi to kilometers: d (km) 20mi × 1.609344 32.18688km. DOWNLOAD: Go From Couch to Half Marathon in Just 20 Weeks with This Training Plan. The distance d in kilometers (km) is equal to the distance d in miles (mi) times 1.609344. So, if you can't find the exact time in these charts head over to Running Calculators page and check out the race finish time or pace and speed calculators. 1 mile is equal to 1.609344 kilometers: 1mi 1.609344km. UPDATE: Since publishing my pace chart articles I've created several calculators. If you want to check out marathon race paces, I've created separate charts for that distance which you can see by clicking here. Just in case you have a hankering to try and beat the fastest half marathon performances of all time!
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