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Add gravity. Be sure to incorporate strength training, walking or anything weight bearing to help prevent the loss of bone density, said Pete McCall, an exercise physiologist with the American Council on Exercise. Also spend an equal amount of time on your back to help balance out the curves of the spine, recommends Jill Murphy, a physical therapist, licensed athletic trainer and strength and conditioning specialist in Neenah, Wis. Adding some backstroke into the mix "will stretch your pectoral muscles and work the muscles between your shoulder blades that help stabilize your spine and maintain your posture all day long," she said.