Final answer:
Aerobic exercises like cycling improve aerobic capacity and strengthen heart muscles.
Step-by-step explanation:
Aerobic exercises, such as cycling, help improve your aerobic capacity and strengthen your heart muscles. These exercises cause your heart to beat faster and allow your muscles to use oxygen to contract. Activities like mowing the lawn, shoveling snow, and cross country skiing are also great examples of aerobic exercises that can help build endurance and make your heart stronger.