We have found that walking is linked with less severe sleep apnea. A study looked at home environment, activity level (monitored by a device worn on the wrist) and sleep apnea severity (AHI or apnea hypopnea index). The people that lived in neighborhoods where it was more pleasant to be outside and walk had less severe sleep apnea (lower AHI) than those that lived in unpleasant neighborhoods for walking. In the same study, the people that were more active (perhaps walking more) had a lower AHI than those were less active. While this is preliminary data, it suggests that by getting out and walking more, you may be able to reduce your sleep apnea severity.