This is a question for those of you who do lactate threshold training. Can you tell, by how your body feels, if you're at the lactate threshold?

I've read about it, and I hear it's a good way to improve performance. I hope that's what I've been doing intuitively. I do my best to stay right on that fine line between "feeling the burn" and just barely not feeling it. I keep pushing until I feel it and then barely backing off. It keeps me breathing hard but not too hard, so I can maintain that pace for over an hour. I'm not sore after a long ride this way, but I couldn't ride like that every day because I just get too run down.

Do you think I'm doing it?