Watch Fittest on Earth: A Decade of Fitness (2017) HD Full Movie Free on SolarMovie. Watch Fittest on Earth: A Decade of Fitness (2017) online free. Forty of the world's top athletes battle through 15 events and five grueling days of competition for...Forty of the world's top athletes battle through 15 events and five grueling days of competition for the title of Fittest on Earth. Who will rise to the top and prove the fittest?