In the beginning, there was yoga. Next, hot yoga caught fire. But for Seattleites, even that wasn’t enough of a mind-body challenge. Now, behold WASUP: Washington Stand-Up Paddleboard Yoga. At last we can execute warrior poses while balancing atop a paddleboard in the middle of Shilshole Bay. Part of the Washington Surf Academy (wasurfacademy.com), which…