Sure. Our ancestors evolved on the hot savannah. Lack of fur helped keep them cool. Keep in mind, our ability to regulate our body heat makes humans one of the best long distance runners of any species out there.
Our ability to move swiftly with the agility of an animal?
We never really evolved in that direction. We evolved intelligence which has turned out to be a much better adaptation. Moving swiftly? That takes walking on all fours, which would have been a serious problem when it came to tool-using.
OOOOH so we were naked and slow and helpless and STUPID and STILL managed to survive? Wow that's amazing! Evolution really IS magical!
And that's why today, all them critters out on the savannah are HAIRLESS!!!!!!