Answer:
Sprinting (running fast) for 100 yards
Step-by-step explanation:
During cardio exercise such as running, your heart rate increases.
Sprinting, a form of high intensity interval training, is a cardio-respiratory training method where you alternate short bouts of maximum effort with recovery periods. Sprinting at maximum effort causes your heart to beat rapidly, thereby strengthening your cardiac muscles and improving blood circulation.
Walking is good cardio exercise — if you go at a brisk pace of at least 3 miles per hour.
Cardio exercise refers to anything that gets your heart beating faster. Aerobic exercise will increase your heart rate and increase the circulation and blood flow throughout the entire body.