According to blog’s John about that "we don’t need to breathe during freefall because they can absorb oxygen through their skin" and then found out on this websites by using the keyword "how they breathe while skydiving". from this website it is tell about "can you breath in free fall?" and it tell about that "Yes, we can" but it doesn't tell about absorb oxygen through their skin. Breathing while free fall and parachute with the environments in the sky it doesn't affected to be troubled by breathing, just breathing normally. (Island, 2013)