Alberto Salazar is a great coach. He coached many famous long-distance athletes, including Mo Farah and Galen Rupp.

Long-distance running is a sport for very skinny people. The golden rule of long-distance running was formulated by Belgium runner Emil Puttemance back in 1972. "The less you weigh in life the more you weigh in the race."

If Mary Cain isn't very skinny she should probably change the sport. Look at Almaz Ayana. She's but skin and bones.