Speed play (aka Fartlek) — Fartlek, commonly known in the U.S. as interval training, is the Swedish word for “speed play.”

法特莱克训练法——也就是在美国众所周知的变速跑。

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Incorporate several cardio techniques - Use a combination of continuous, interval, circuit and Fartlek (speed play) training.

有氧运动技术的综合运用-连续，间隔，循环，以及变速跑等手段需要综合运用。

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