Errr, it's hard to critisize a study based on this report alone but a 2 year weight-training program shouldn't be compared to handing out a brochure. It should be compared to a 2 year cardio program and a 2 year mixed program.
If they gained 7% abdominal fat in 2 years, how fat are they going to be 20 years? And this is for the weight-training group? The others will have become whales in 20 years for sure.
And I don't want to lift weights to have my abdominal fat increased. I want it to go down.
From what I read, it's a sloppy study.
Or it's a sloppy report.