FormFactor is a free running performance lab that runs entirely in your browser — no login, no ads. Enter your distance, time and conditions. Get your VDOT corrected for elevation, temperature, wind, humidity and surface. Then: training paces across 5 zones, race predictions from 800m to 100km, World Athletics points, age grade (WMA 2015), GPX import, training plan, pace band, HR zones, shoe tracker and more.
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