physical activity

What’s the Difference Between Fartlek, Tempo, and Interval Runs? | Runner’s World

Fartlek, tempo and interval runs- defined by Runners World. Enjoy!

http://m.runnersworld.com/race-training/whats-difference-between-fartlek-tempo-and-interval-runs?cid=social42638236&adbid=580700711660359681&adbpl=tw&adbpr=14882900

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