Even when he was just starting out, he usually was in the front of his competitors. His ability to utilize oxygen is very high. His latic acid threshold is very high. When he went though his cancer treatment, his muscles became very weak. When his muscles rebuilt after the treatments were over, he exercised mostly his legs. If you look at his upper arms and shoulders, you can see they are a bit smaller that the other racers. This gives him the same lower body muscle strength yet about a 5% lower total weight.—mike.a.sch...@gmail.com