He set it at 4, whatever that means. I assumed it meant 4mph, which is brisk walking speed. However, he covered 2.5 miles in 30 mins, so he either increased it to 5 or he's lying about the time taken or distance covered. Even if he isn't lying, 5mph is about as slow as it is possible to jog without breaking into a walk, and 30 mins is nothing to brag about*.  *Unless you're Ragen Chastain, in which case that's Elite level pace.