LBP in this context I meant Lactate balance point ( not lowback pain as it might normally read in my shorthand)- the lactate balance point from what I have learned is the point at which your body is producing enough lactate to buffer the hydrogen your cells produce during aerobic activity. My understanding is that it is slightly different than anerobic threshold- or at least the method of measuring it is slightly different but not to get caught up in too many details- I just meant to keep it easy with all that running and you will be great!
Good luck on your run! That sounds like a tough assignment- Run til you puke Glad it is you and not me