Heart rate-based interval training involved exercising at varying heart rate intensities, suitable for people of all fitness levels. It began with activities like walking, combining high and low-intensity intervals to boost cardiovascular health and burn fat. The training used heart rate monitors to track progress, recommended hydration, and stretching to prevent fatigue and improve recovery. Heart rate-based interval training involved exercising at varying heart rate intensities, suitable for people of all fitness levels. It began with activities like walking, combining high and low-intensity intervals to boost cardiovascular health and burn fat. The training used heart rate monitors to track progress, recommended hydration, and stretching to prevent fatigue and improve recovery. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle