Originally Posted by
Brian Ratliff
What's he referring to? If you are talking about long intervals but less than 1 hr, then you should probably be at a wattage somewhat higher than ftp.
He's referring to intervals of up to 20 min. He states that the intensity should be approx. LT-5 BPM. He specifically states that you should train slightly below LT. He says "spending too much time at your LT is too taxing and will ultimately diminish any gains".
It's basically Sweet Spot.