How about a waterproof fitness tracker to help track their swimming activity and progress? This would be a practical and useful gift for someone who loves freestyle swimming. Alternatively, you could consider purchasing a high-quality pair of swim goggles or a personalized swim cap. Another idea could be a subscription to a swimming magazine or a book on improving swimming techniques. Lastly, you could consider organizing a private swim session with a coach for your friend so they can work on perfecting their freestyle strokes.
Or you can get her/him a star map with the date when she/he was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.