2012 Olympic champion and decathlon world record holder Ashton Eaton tops the list of fittest male athletes.
SI teamed up with fitness experts and coaches to determine the fittest 50 male and female athletes on the planet.
Former Olympians Ashton and Brianne Theisen-Eaton bring the games to the office as they compete in SI's Office Olympics.
What measures and benchmarks should we use when comparing athletes of all shapes and sizes, from disparate sports? Here's an inside look at how SI choose its 2020 Fittest 50 and why Simone Biles and Giannis Antetokounmpo are this year's top athletes.