Problem:

Question 1: You might have seen the "fat burn" mode on exercise equipment at the gym. This mode is typically a workload at a low exercise intensity. Does exercise performed at a low intensity really burn more fat compared to exercise performed at moderate- to high-intensity assuming equal exercise duration?

Question 2: How might you expect the muscle fiber and metabolic characteristics to change for an individual training to become a track sprinter (eg. 200m and 400m dash)?

Please provide description of your answers.