Keep Those 2×20’s Coming By Uhl Dec 30, 2007 Eagle, ID More of the same old, same old; two 20-minute Lactate Threshold (LT) intervals with five minutes rest in between. Legs felt a little weak but I was able to breathe just fine. Nice to be back at 2000 ft above sea level. Tags: training, wattage PrevOlder1×30 NewerHappy New Year!Next