It's interesting, but I don't think strange in the sense of being inexplicable. Hot is an obvious side effect of global warming. Cold may be counterintuitive,

It's interesting, but I don't think strange in the sense of being inexplicable. Hot is an obvious side effect of global warming. Cold may be counterintuitive, but "global" warming (as opposed to local warming) refers only to the global average, and in Earth's case exacerbates both extremes. With sports, as with any human endeavor, athletes are standing on the shoulders of giants; advancements in things like nutritional/medical science, food availability, fitness/training techniques, technology of gear/clothing/accessories, tactics and strategies in particular sports, and financial investments in sports should all contribute to continued broken records approaching the asymptote imposed by human genetics.