No, cardio does not necessarily prevent muscle growth. In fact, cardiovascular health and capacity can actually contribute to muscle growth for most people. It's important to note that the context matters here. If someone is struggling with not eating enough food and is a hard gainer, then excessive cardio may make building muscle more difficult. However, incorporating some form of cardio, such as sprinting or high-intensity interval training (HIIT), can be beneficial for muscle preservation and even muscle building. It's all about finding the right balance and considering individual circumstances. Remember, the most anabolic form of cardio is sprinting. So, if you want to maximize muscle growth while still enjoying the benefits of cardio, incorporating sprinting or HIIT into your routine can be a great option.