Aerobic endurance sessions builds the ability of the body to continue working at a high intensity for a long period of time. This is important in any sport because it helps you maintain your energy levels and avoid fatigue.

Zone 2 running should feel comfortable and sustainable, but still require some effort. Zone 2 is considered to be a moderate intensity effort, typically between 70-80% of maximum heart rate, and is commonly used for aerobic base training.

During zone 2 running, you should be able to maintain a conversation without gasping for air, but should still feel like you are working somewhat harder than during a leisurely jog. It's important to note that your pace during zone 2 running will vary depending on factors such as fitness level, terrain, and weather conditions, so it's best to use a heart rate monitor or perceived exertion to ensure that you are staying within the appropriate zone.