Why do we feel lighter in weight in a swimming pool?
We feel lighter in a swimming pool because the water exerts an upward force or buoyant force on our body. This is because the weight of our body in water is equal to the apparent weight.
Instruction: Why do we feel lighter in weight in a swimming pool?
Context: 
Response: We feel lighter in a swimming pool because the water exerts an upward force or buoyant force on our body. This is because the weight of our body in water is equal to the apparent weight.