Joining us today is Mark Grevelding, founder of Fitmotivation, the incredible online video and streaming resource for aquatic fitness instructors as well as PoolFit, a brand new app that allows consumers to easily download aqua workouts and use them poolside. Mark joins us to discuss his journey in the fitness industry over the last 25 years and why he believes if you're currently just a land instructor, why you should think twice about  cross-training in the water.