Designed for stand up paddling, which requires maximum flotation and stability. The Orca has a flat bottom and enough rocker that it is at home paddling into a wave. The round rails and high volume make for effortless paddling, whether you are catching waves the way the ancient Hawaiians did or simply cruising the bay. The Lake Superior has slightly less nose and tail rocker than "The Orca" because it doesn't have to contend with waves. Throw away the treadmill, these boards is all the workout you'll need.