HIIT Workout Plan for Beginners: Free 4-Week Program
HIIT (high-intensity interval training) means alternating short bursts of hard effort with recovery periods, for example 30 seconds hard and 60 seconds easy, repeated 6–10 times. The hard intervals push your heart rate close to its maximum, so a 20–25 minute session, warm-up included, can build aerobic fitness in far less time than steady cardio. […]