I walk to reduce stress, and clear my mind. It is also a wonderful way to exercise while enjoying nature, especially during this time of limited personal interactions due to COVID 19. I still wear my mask, it keeps my face warm during chilly March days. On some occasions I run but find walking helps me to sort out issues of the day.

Walking is a great way to reduce stress and improve your endurance. This exercise can be enhanced by using weights, or add an occasional run or sprints to increase your intensity. This will improve your muscle strength and stamina. There are also apps available to measure steps and mileage or to assist with guided mediatation.
On some occasions I listen to music but for the most part I enjoy the sounds of nature or the stillness or the day. If you walk in your neighborhood you might be surprised what you notice and appreciate. What ever you choice to do, enjoy it. Walking is great exercise for both your mind and body.
Notice how refreshed you feel when have the intention of enjoying a walk and reflecting on the day.
Reference
Jung, 2021. Walking can change your life. Prevention. com. 33