So you may have read that the protagonist of Doom (1993) has a running speed of anywhere from 45 to 90 miles per hour (depending on how you calculate distance in Doom maps). But to me the more interesting part is that the escape velocity of Phobos (the moon of Mars where the first episode of Doom takes place) is only about 25 miles per hour, which means that with a good running start, he could have just jumped off.