Easy exercises you can do in four minutes flat in bed. Energize yourself for the day. Relax yourself for some solid sleep every evening. If you do this every morning and evening for 120 years I guarantee you will live long :^)
I've recently written a Google Knol Exercise in Bed - Do Your 4's that describes some easy exercises I have done almost every day for the past six or seven years.
Why not give them a try?