Reddit mentions of Lactate Threshold Training

All the answers you need are here:

http://www.amazon.com/The-Mountain-Bikers-Training-Bible/dp/1884737714

As /u/milliken says, having a structured training plan is definitely beneficial. I'm just now starting to develop my plan as I get back into racing after a long layoff, and I've found this book indispensable.

FWIW, I also recommend:

• http://www.amazon.com/Lactate-Threshold-Training-Peter-Janssen/dp/0736037551
  
• http://www.amazon.com/The-Cyclists-Training-Bible-Friel/dp/1934030201/ref=pd_sim_b_5?ie=UTF8&refRID=1BHJ1VR61WPGYDBP8TAC
  
• http://www.amazon.com/Training-Racing-Power-Meter-Hunter/dp/1934030554/ref=pd_bxgy_b_text_y
  
• http://www.amazon.com/The-Power-Meter-Handbook-Triathletes/dp/1934030953/ref=pd_bxgy_b_text_z
  
• http://www.amazon.com/Precision-Heart-Training-Edmund-Burke/dp/0880117702/ref=sr_1_1?s=books&ie=UTF8&qid=1427498205&sr=1-1
  
• http://www.amazon.com/Serious-Training-Endurance-Athletes-2nd/dp/0873226445/ref=sr_1_5?s=books&ie=UTF8&qid=1427498205&sr=1-5
  

Why... I told you why. Three energy systems are antagonistic to each other. Your training cycle should contain different types of workout. If you run only slow miles, you will have a great health and run pretty fast at low HR, but you will have a poor anaerobic strength and you won't perform really well in races. If you run only fast miles you will have poorer health (it is like a joke, but sitting on the sofa could be better in some cases of overtraining) and weak aerobic system that means you won't perform well in any endurance competition and your avg paces from HM to FM will decrease dramatically. So fast or slow? The answer is "both" and only both.
If you think Maffetone doesn't suggest anaerobic trainings, it isn't truth. Check it here if you don't believe me: https://burnfat.philmaffetone.com/article/61-maf-plateau-speed-work
And if I told "any book", it is really any book! That are recognized well-known basics. Here are a couple of examples except Maffetone and books topic starter was already recommended:
https://www.amazon.com/Lactate-Threshold-Training-Peter-Janssen/dp/0736037551
https://www.amazon.com/80-20-Running-Stronger-Training-ebook/dp/B00IIVFAEY

Boat Race before last the bowman of the winning boat was 5'10", huge heart and lungs, and weighed in the mid 80's (KGs) if I recall, so built pretty solid.

To go sub 6 is the elite standard, but don't forget weight adjustment, there's no point going sub 6 mins if you weight 200kg, no one's going to enjoy dragging a hippo in thier boat if he's not pulling his own weight and then some, the calculator and an explanation of weight adjustment are available here http://www.concept2.com/us/interactive/calculators/weight_adjustment.asp
Train on sliders, or take out a single, there is 10x the chance of an injury in land training than on the water.
long steady pieces are also good, don't even go for distance, just sit on an erg for 30 mins, an hour or even 90 mins, it won't wreck you because it shouldn't, but it will improve your times.

READ: You're going to have to live and breath rowing, I'd recomend the following (Not that I've read them all, but i've ordered them and almost finished the original print of Rowing Faster)

http://www.amazon.com/Rowing-Faster-2nd-Volker-Nolte/dp/0736090401/ref=sr_1_1?ie=UTF8&qid=1314681440&sr=8-1 http://www.amazon.com/High-Performance-Rowing-John-McArthur/dp/1861260393/ref=pd_bxgy_b_img_b http://www.amazon.com/Lactate-Threshold-Training-Peter-Janssen/dp/0736037551/ref=sr_1_1?s=books&ie=UTF8&qid=1314681471&sr=1-1

You're gonna need to know more about rowing and training than anyone on the team, because the hours you'll be putting in will make you your own coach.