Yes, Nirn isn't Earth. However, in Fantasy and Sci-Fi Literature, Earth and its properties are used as a template to give the reader (or in this case video game player) a way to comprehend and interpret the world. With this template, the author (or video game maker) then modifies specific details (history, races, magic, etc.) in order to create an interesting and enjoyable story and setting. If something unnatural by our standards isn't explicitly intended or stated to be lore, then it isn't lore. Running 60 MPH isn't intended as lore. It's not like the writing teams at Bethesda had a meeting where they decided "Well, in Nirn the 10 races have ultra-super running abilities and can outrun horses, deer, bears, mountain lions, and anything else, all while wearing 100 pounds of armor!". The reason the absurd running and jumping is in the game is because the gameplay was designed that way, not because the lore writers thought that 70 year old bretons in steel armor can naturally leap 50 yards and sprint 60 MPH for days without a break.
Yes, some of you have brought up books in the lore that talk about running and jumping. Yes, people in Nirn do indeed have better athletic skills than on Earth, but some of you are conflating that to mean running twice the speed of a horse is perfectly normal in Nirn, which is absurd. Saying gameplay mechanics count as lore is silly. If gameplay mechanics count as lore, then Star Wars lore says that Lightsabers don't kill people with one slice and Jedi can be shot 50 times in the chest because that is what happened in The Force Unleashed.
Just my thoughts anyways. :teehee: