Saw a guy pass out after a DL today, made one step after and dropped. He was up in under a minute but a discussion ensued. Is lifting so heavy you pass out killing large number of brain cells? (Though I'll admit from reading on this forum blacking out at circa 500lbs is kinda silly but hey its more than I can DL) Basically is it unhealthy to push that hard. Many times lifting I've had to sit down cause the peripherals of my vision start going black. Actually happened once today. I get that it shows dedication and such but is it actually beneficial. The Marines say the same for throwing up, and I would naturally think its bad for you, but many Olympians are said to throw up multiple times in a week in practice...... So while I'm at it, is going to the point of throwing up bad for you as well? I've seen it intermixed in threads here before... will many varying opinions from lots of people I've learned from. So while I appreciate input if you could cite a source I would appreciate it more.