"The drag profile of a person (the surface area facing the water in the direction of motion) is most likely the most important element in swimming speed." As a result, a swimmer with a higher girth will confront more resistance than a slim swimmer, according to Heggy. "However, if this greater mass moves through the water at a slower rate, then the swimmer will travel farther before reaching the end of their stroke," he says. The body's center of gravity is raised when you add weight to your frame. This means that you require more force to move your body down the pool because the trajectory of your descent is now uphill, explains Heggy. In addition, the greater mass of flesh and bone that you carry creates more of a load for your muscles to move during each cycle of your breath. So yes, it is easier to swim when you're not overweight. However, if you struggle with obesity, working on your form is a good idea no matter your weight.