How does water immersion affect a person's buoyancy?

Water immersion affects a person's buoyancy by decreasing the overall weight experienced while in the water. This decrease in effective weight occurs due to the upward buoyant force exerted by the water, which helps to support the body's weight. When a person is submerged in water, they experience a reduction in the gravitational pull that they feel, allowing for much easier movement of joints and muscles. This phenomenon is particularly beneficial for individuals with arthritis, as it reduces the stress on their joints and allows for greater freedom in movement while exercising. Thus, the buoyant force contributes to a feeling of weightlessness, which can significantly enhance the experience of exercising in water.