You don’t need to train for a marathon. Exercise is anything that will make you breathe a little harder than you do at rest. It can be dancing, climbing stairs, hiking, or walking.
Do you work in an office? Try substituting sitting meetings with walk and talk meetings. You can also consider some standing exercises while in the office to stimulate oxygen/blood flow and your metabolism (such as squats, lunges, arm circles, or torso twists).
Do you have a dog? If you usually walk your dog only for the length of time it takes for him/her to go to the bathroom, try tacking on five more minutes to the walk. If you let your dog out four times a day, that’s already 20 minutes of exercise! Or, try alternating a brisk pace minute with a moderate pace minute while walking your dog.
Walk instead of drive to locations that are relatively close.
Join Fit4Mom or Stroller Warriors (if available).