Yeah, I realize now that our feeds are not well standardized...
There is a site wide feed of all blog posts and all comments across the entire site, available at:
http://sweat365.com/site-feed/
http://sweat365.com/site-feed/comments/
The feed for just the "main site", which includes the library, news, and other new posts we post to the home page is at:
http://sweat365.com/feed/
There isn't currently a comments feed...
So as I type this it makes me realize that it would be good if we standardized /rss/ vs. /feed/
We'll look into that for a future release.