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interval training

noun
1.
an exercise and training program in which each session consists of periods of intense exertion alternating with periods of rest or lighter exertion.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for interval training

interval training

noun
1.
a method of athletic training using alternate sprinting and jogging Also called fartlek
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for interval training
noun

athletic training which alternates between two different activities, such as walking and jogging, or between two different rates of speed

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