Read this same study the other day. I thought it was interesting that the difference between the group that took steroids and worked out only gained 6 more lbs of muscle than the group that didn't work out. I thought it would've been a much bigger difference. Mainly that the group that didn't train would've gained much less. I would like to see what the diet and training actually looked like, and how they split the age groups / which age group gained more or less. 19 - 40 years old is a big gap, and I'm assuming they took an average of all the gains for each group.