I agree with this comment. I would personally very much like to see some talk about given links. However, I believe it would decrease the quality down. Yes, Hackernews has this; but there are really well-informed people here and active. It is not the same with fitness world.
Why do you say there are no well informed people in the fitness world?
If you go over to /r/fitness there are some active and well informed people, so I'd have to disagree with you.