HIIT. Walking is the easiest cardio activity to incorporate into your life and may help boost your immune system. For higher-intensity exercise, try activities like running or cycling to help with weight loss and reduce stress. Common forms of cardio include running, cycling, swimming, and walking. Each type has a ton of benefits that include weight loss, improved health, and stress reduction. Here are some of the best types of cardio and the health benefits for each of them. Advertisement Running Running is one of the most popular forms of cardio exercises. Some people might opt to jog instead of run. Both activities are similar, the main difference between the two is that running is done at a faster rate.