The story of Arthur, a stray who adopted a team of Swedish athletes competing in Ecuador, spread quickly after he refused to be left behind. Krister Goransson/Peak Performance hide caption

itoggle caption Krister Goransson/Peak Performance

Nicholas Mevoli in a video, posted in in August. He talked of his love for freediving. On Sunday, Mevoli died after trying to set an American record. YouTube.com hide caption

itoggle caption YouTube.com

A runner tries to escape with his life as zombies pursue him during the Run for Your Lives race. The 5K course is littered with obstacles — and the undead. HGL hide caption

itoggle caption HGL