Before revision: Modern definition and utility Fartlek has been described as a " relatively unscientific blending " of continuous training—whose forms include long slow distance training—with its steady pace of moderate-high intensity aerobic intensity (where by this is implied a level of activity at 60-80%DIF < VO2max) and interval training, with its "spacing of [more intense] exercise and rest intervals".
After revision: Modern definition and utility Fartlek has been described as a “ relatively unscientific blending ” of continuous training—whose forms include long slow distance training—with its steady pace of moderate-high intensity aerobic intensity (where by this is implied a level of activity at 60-80%DIF < VO2max) and interval training, with its "spacing of [more intense] exercise and rest intervals".