“I feel more comfortable playing quarterback than I do walking”

Simplified Meaning:

The person is saying that they feel more confident and at ease when playing the role of a quarterback in football than doing something as simple as walking. This implies that their skills and comfort level in their particular role are very high, even higher than performing everyday activities. For example, think about a chef who can cook a complex dish perfectly without thinking twice but might feel awkward or uneasy while dancing. It’s about being so skilled at something specific that it feels more natural than basic tasks. This can teach us that with enough practice and dedication, we can become exceptionally good at something and make it our strong point. So, if you focus on and practice what you love or what you're passionate about, you might find it becomes a second nature to you, even easier than things most people find simple.