H2O Vertically Challenged With Ann Gilbert Vertically challenged is an aquatic class that will address the postural alignment challenges and the functional needs of the mature adult. To access this content, you must purchase OnDemand Monthly Subscription Payment Plan, OnDemand Annual Subscription, OnDemand Monthly Subscription, OnDemand 6-Month Subscription or OnDemand 2 Year Subscription or log in if you are a member.