Most ocean rowers feel a bit queasy for the first few days of an ocean row. As their bodies adapt to the conditions these feels subside. Anti-sea sickness medication helps to reduce the effects of motion sickness but isn’t generally required after the first few days of being at sea. The motion of an ocean rowing boat is very different to being on a bigger vessel, you’re also outdoors and close to the water for most of the time so many people who think they suffer from motions sickness don’t when onboard an ocean rowing boat. If you don’t get seasick going swimming or surfing you should be fine on an ocean rowing boat.