My son is 12-yr-old, he had been swimming for over 4 years. He had been a very good breaststroker within his age group. Since last year, he suddenly improved on every other strokes, such as freestyle, back

even fly, but his breaststroke had been falling apart, his coach said he had wrong arm-leg timing, and his stroke looked odd, not smooth anymore. Since then, he could not improve the breaststroke events but

add time. He was very frustrated, so we are seeking help. Thanks!