INS and type 2 diabetes mellitus: Ameliorated insulin sensitivity, improved fat oxidation, and reduced cardiometabolic risk in individuals with type 2 diabetes were found after 6 weeks of a HIFT program including short 8–20 min high-intensity workouts at >85% HRmax (Fealy et al., 2018), with a concomitant β-cell function improvement (Nieuwoudt et al., 2017).