I found that walking not only relieves stress and aids in better sleep. I do my best process thinking when I walk. I also listen to rock classics by Queen, Bob Seger, Jimmy Buffett, Journey, Foreigner, REO Speedwagon, etc.
Start with a half mile, then build up on it at a pace you are comfortable with. Most Smartphones have a tracking app for you to track distance and time each day. I have a Samsung phone with a Health app where I track this stuff. What I need is a Fit Bit to set up with my Weight Watchers app to track Activity Points. I track my meals each day and stay within or under my daily point allowance. The extra points earned via Activity add up and I rarely touch my extra weekly points I am given. I look at that as a calorie deficit I am not eating back in order to maintain here I am at each month I weigh in. I have not had to pay in over 5 years due to cutting out certain foods I have allergies like wheat based (gluten issues), beans, soy, white potatoes, most dairy except for Greek Yogurt.
I walk on average 3 miles a day in under an hour at a 3.2 mph pace. At least an hour total each time. At our Senior Living facility, there is a nice Fitness Center with a Treadmill, Elipticals, bikes. Also a big screen TV to watch my MSNBC shows if I do not get to the swanky gym. Some weights as well for various other exercises.
Keeping fit at an older age reaps HUGE benefits all around for a more fulfilling life and lifestyle. My Doctor wished he had more patients like me. Though I am having some issues with fluid retention that is affecting my Blood Pressure. I am doing some things differently to remedy that before I see him again next week.