When designing your own exercise program, the most important thing to consider is do you enjoy it? If you enjoy it, you will keep doing it without constant self-reminders. Maybe you love swimming, tennis, basketball, hiking, cycling -- find your passion and go with it. Not only will you keep on your program, you will bring joy and lightness to your life.
Personally, I take a nature hike with my dogs every morning, and I love to work in the garden, digging new beds, weeding, etc. These activities give me enjoyable times and a variety of exercise.