Cooling down in heatwave

needed to do warm up workouts to relax the muscles before i swim.A cat at the side saw us swimming and looked curious n tried dipping his paw into the swimming pool.i know the dog paddle but i dont know if cats can swim so i shoo the cat away. I dislike the kids in the pool playing with huge ass water guns n shrieking at the top of their voices. Ive to swim more to regain my stamina.I used to swim in the Olympic size pool doing 10 laps effortlessly but now after 4 laps,im breathless.totally lost my stamina n pace but i need to train more.jia.you.