Learning to swim

Isaiah has been taking swimming lessons for about 3 years and still is a beginner. His biggest problems are his fear of getting into deep water and that very cold water bothers him. Isaiah is very, very skinny. He has very little body fat. He shivers like crazy if he gets in a pool that is not heated. This weekend he had a swimming class on Saturday and on Sunday we went to the pool. Neither day went very well. Both times Isaiah could barely do anything because he was so cold.
At end of our afternoon at the pool on Sunday, we discovered a 2nd, heated pool at our community center. Isaiah was very excited. He ran in the water and had a ball. He still did not want to practice going under the water or kicking his legs. "I just want to play!" However, as we left, he agreed that he would work on learning to swim if when we return to the heated pool. The problem with that is that his swimming lessons are not in a heated pool. So we will see how it goes at his next lesson.