Swimming is a recognized form of exercise for both kids and adults, and this applies to infants too. Moving arms and legs in water requires more effort compared to air, leading to strengthened joints and muscles. It's recommended that children learn to swim at some point, whether it's at the age of 2, 4, or 6. Studies indicate that children who start learning at age 2-3 tend to acquire swimming skills faster than those who begin at age 4.