Check with your doctor before beginning any new exercise program. Walking may be the best option. It is free and easy to do almost anywhere, and it gives your body a good workout. Other good choices are swimming, using an exercise bike, and yoga. Another way of coping with fatigue is to get on a regular schedule.
Rest is very important.
You need to make sure you get a full night's sleep every night. A 30 to 45 minute daytime nap can help give you an energy boost. You should let your doctor know if you are having any difficulties sleeping. If you have a stressful job, you may need to make some changes to lessen your workload. The same holds true for a hectic home life.