High-Intensity Interval Training (HIIT) involves bursts of activity at 80-100% of VO2 max, lasting 60-240 seconds, with recovery periods.

“One of the best ways to improve VO2 max is high-intensity interval training - particularly with longer intervals.”

“So for the individual who is time-pressed, I don't think there's a need to do three to four hours of what I understand to be zone two training weekly in order to maximize improvements in VO2max.”

“the idea that high-intensity interval training is only Anor robic is a misconception while high-intensity interval training exercise does rely more heavily on Anor robic Energy Systems it still required significant aerobic metabolism so hit can improve both aerobic and anerobic fitness”

“obviously for individuals who are time pressed and can't dedicate several hours per week to doing a more type zone two type of training including shorter sessions of higher intensity exercise can still have significant improvements in BO2 Max and overall health”

“hit has been shown to significantly improve E2 Max even with shorter training durations this is because hit recruits both aerobic and Anor robic Energy Systems and increases the intensity of the workout resulting in um greater greater cardiovascular stress and then adaptations”

“I think it's pretty clear that high-intensity interval training is one of the best ways to improve your B Max and particularly when you do longer intervals”