A few years ago my doctor recommended that I walk at least 150 minutes weekly which works out neatly to 1/2 hour, 5 days a week. I adapted well to this recommendation since I like being outdoors in the fresh air, and I usually do my walking in the nearby park which provides wildlife and plants to view. Pam sometimes goes with me and once or twice a week my friend Stan who lives on the other side of the park meets me in the middle. Having someone to talk with seems to shorten the time.
Before long I was considerably exceeding the minimum amount because I became addicted to the point that I feel uncomfortable on the few days when I'm unable to walk. Those exceptions usually occur because of obligations such as travel or multiple appointments. College classes don't pose a problem because I just do the walking on the large University of Maryland campus.
Weather is seldom a factor during the warmer months because walking in the rain doesn't bother me as long as I wear a rain slicker. Cold weather onto itself won't keep me from going out, but a cold rain or snow is something else. On such days during the school year I head for Cole Field House on campus where I encounter other walkers and runners on the concourse of the large athletic building. Unfortunately, Cole is undergoing a major remodeling which makes it unusable for these activities, and the Comcast Center which replaced Cole for basketball games is often restricted.
Fortunately, we have treadmill in our house which has been idle and collecting dust for years. Other household members have used it in the past, but I never developed much of a fondness for it. Recently, however, necessity has caused me to reconsider it. I've found that listening to music while using it relieves the boredom and works pretty well for me. Keeping the lights out in the room prevents me from focusing on the treadmill timer which detracts from the music and makes the time seemingly pass more slowly when it grabs my attention.
Walking outdoors will always be my preference, but I'm glad I now have a tolerable indoors option.