I really enjoyed the programme, some thoughts below:
Insulin sensitivity improved by exercise in just 2 weeks.
20% of people will be 'non-responders' to exercise, at least in terms of VO2 max - what the programme didn't really highlight enough for me was that the subject still went for longer, and felt easier doing the VO2 max test. Surely demonstrates benefit in stamina? Although he didn't produce higher VO2, he sustained his maximum for longer!
Body fat not necessarily bad, so long as viceral fat is low, and the fact that this starts to change quite soon after starting an exercise regime. I like this, I'm probably skinny on the inside, if not on the outside :)
Other stuff as already noted by folk above...
Oh, I also got caught out on my ahem *sums* by someone on Twitter who kindly pointed out it was only 20% of non responders, rather than the 85% that I appeared to have magic'ed from nowhere - @baldcyclist Just 3 minutes speed reading per week can dramatically improve your ability to extract relevant data from an article ;) - I thought that was quite funny, and appropriate!