This trial will test if a breathing exercise called Inspiratory Muscle Strength Training (IMST) can lower blood pressure in adults over 50 with sleep apnea. The exercise strengthens breathing muscles, which may help relax blood vessels and reduce heart stress. Researchers hope this will be an effective treatment for those who don't respond well to other methods. Inspiratory Muscle Strength Training (IMST) has been shown to lower blood pressure and improve cardiovascular health in various populations, including those with obstructive sleep apnea.