Exercise 2:
D: yes, he is much fitter than a normal adult and has little bodyfat.
E: Liam's body is lacking protein which is why his muscles keep growing.
F: he has a large stamina.
G: 1. run 50 marathons within 50 days.
2. run for three days without sleep.
H: they can be active for a long time since they don't get tired.