blue child indoor lesson lessons pool sport swim swimming swimming lesson water water sport waves background brasil brasilia brazil breath breathing bubbles chlorine cool diving radical soft swimming pool wave wavy active activity artificial artificial waves bathers bathing board children enjoyment exercise fun generated generating motion movement paddle paddling parents people teens wave pool young adults young people youth buildings Camp campsite campsite pool care clean clear contained danger duty of care edge enclosed entertaining entertainment fence outdoor outdoors poolside private protected protection recreation recreational reflections relaxation relaxing responsibility responsible rural safety sectioned-off secure security shade socialising surrounding surrounds trees feet kick swimmer