A brown-haired boy in swim trunks is flipped backwards over a swimming pool.
A brown-haired boy is swimming.
A boy is learning how to cook.
There are costs to heart and lung disease besides money.
A man and a woman exit and enter a kitchen.
People are outside making purchases.
A person is skiing
A group of people eating outside at tables
There is no problem with the use of ellipses, in fact, they make things clearer.