I have played many different sports throughout my life and I believe swimming is the most demanding sport I have experienced. Swimming a few hundred meters in a pool is a ton of work. Now imagine swimming 50 miles in Lake Michigan without touching a boat or the bottom the entire time! My cousins, Jeff and Sara Tow, are going to attempt that amazing feat in August. F4.5 at 1/1600, ISO 400, 10-17mm lens at 17mm