When he was 9-years-old, Soto went to school. He had pain in his legs. He was later told by doctors he had osteosarcoma, a type of bone cancer. To fix it, doctors needed to amputate one of his legs. He played sports as part of his rehabilitation. After he finished university, he became a Level 1 Ski Instructor class at the National Ski School. In 2015, he became of part of Team Chile and represented his country in ski races around the world.