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15 points
FARTLEKS is validvalid
FARTLEK, an athletic training technique [n]
FARTLEK, (Swedish) a training technique, used esp. among runners, consisting of bursts of intense effort alternating with less strenuous activity [n]
FARTLEK, an athletic training technique [n]
FARTLEK, (Swedish) a training technique, used esp. among runners, consisting of bursts of intense effort alternating with less strenuous activity [n]