HIFT is a time-efficient modality of exercise that has been shown to elicit enjoyment and adherence [55]; improve oxygen capacity, insulin resistance, and muscular strength [58], as well as the MetS z-score [59] in at-risk populations; and improve cardiorespiratory fitness [60, 61], muscular strength, and power [62], as well as waist circumference and agility [61] in healthy populations. This evidence concerns the gene INS and metabolic syndrome.