I resisted my 3 years old son in YMCA group swim class (3 kids/per group)
for three sessions total six weeks, Mon - Thurs. half hours each class.
He never played in the water before except in the bath tub. The first class
he cried a lot. I had to step into the water to help the coach. After 15
minute, he feel better. After first session, he leaned how to blow bubbles,
hold the wall to walk about 10 meters,float himself to hold a flat board,
paddle the water using both feet etc. He is in the second session now. The
coach never push him, just let him do whatever he feel comfortable so the
process is so slow. I guess my son may need one year to swim by himself with
different positions.