Step Behind You: Double Step With Marcos Prolo Double stepping at its best! Using the steps vertically, Marcos has designed an advanced, yet easy to teach, double step workout. To access this content, you must purchase Step Behind You: Double Step, 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.