Question

The acronym dirt represents the four variables affecting high-intensity interval training. the "d" stands for ____.​

Answer 1

in this context, the "d" stands for distance of interval
distance of interval refers to the extension of repetition or amount of distance that is hoped to achieve during a specific period of high-intensity trainign.
For high-intensity jumping jacks for example, you're expected to achieve around 50 jumping jacks per one minute