The purpose of this study was to compare the acute physiological responses within and between resistance training (RT) and high intensity interval training (HIIT) matched for time and with comparable effort, in a school setting.

To compare the effects of three different high intensity training (HIT) models, balanced for total load but differing in training plan progression, on endurance adaptations.

Low-volume, high-intensity interval training (HIIT) consisting of 60s work and 60s recovery (60s/60s) repeated for 10 repetitions has previously been found to produce beneficial cardiopulmonary, cellular, and metabolic adaptations in healthy and at-risk populations.

High-intensity interval training (HIIT) and sprint interval training (SIT) elicit similar cardiovascular and metabolic adaptations vs. endurance training.

Enhancing cardiovascular fitness can lead to substantial health benefits. High-intensity interval training (HIT) is an efficient way to develop cardiovascular fitness, yet comparisons between this type of training and traditional endurance training are equivocal.