The speed with which your body can clear the acid byproducts of metabolism and carry oxygen to your mitochondria are affected by cardiovascular training to be sure (confirmed), but there is a basic inequality set up by our very genetics.

CNN: Why Oscar Pistorius deserves to run

Eliminating free radical production would involve completely redesigning aspects of our metabolism, especially the way we use oxygen to extract energy from food.

FORBES: The First Person to Live to 150 Has Already Been Born--Revisited!

Science fiction writers tell us about astronauts put into suspended animation on long trips to the stars, their metabolism slowed to a crawl to reduce food and oxygen requirements.

FORBES: How to Cheat Death

Instead of cooling it to slow its metabolism we keep it functioning at normal temperature and with oxygen and nutrition.

BBC: 'Warmed liver' transplant first