Do nt deliberately go for a walk, you have to play, and you have to enjoy it. There are big geese flying in the sky, flowers around, bees and butterflies flying around, and you do nt care about going fast and flying? Pitching is fun, and you must disregard it. Don't have to stipulate how far you can go when you walk, and don't give up. You don't feel like you are over the mountains and occupying the high groun. How does this text mainly explain walking? ['Expensive.', 'is an effective way of fitness.', 'is an important way to cultivate interest.', 'Focus on the true nature of freedom of expression.']