Is not interval training. You need a monster huge base miles during the Winter to develop the necessary aerobic capacity to sustain your power output at LT for 1 hour. You need tons of threshold power work at 2x20, 2x30, 1 hour, or more. Interval work above your LT power is good for increasing your vo2max power. TT isn't about riding at your VO2 max power for 1 hour. Is about sustain your power output at LT for 1 hour. You may hit your vo2max power climbing up a roller or a hill. That usually lasts about 1 to 5 minutes. The trick here is that for pacing in a TT you are riding at LT power and not have your power dropped because of fatigue. You will be surprised how easily your power output can drop at the last 15 minutes of your 1 hour TT.
Originally Posted by Mothra
Takes about 2-3 years of training to average 25mph on a TT of 10-miles (24 minutes). Requires LOTS of interval training at above 25mph...
The actual amount of time it takes, 2-3 years is
"easy".
But try interval training at 28-32mph to max-HR, 2-3x a week, 5-10 intervals a day with your legs burning red-hot in searing pain from lactic acid, cramping and locking up at the end of the intervals, your heart beating so fast it makes you dizzy & lungs coughing up blood... Spasms and spontaneous cramps in the middle of the night waking you up in screaming agony with your ankles next to your ears... Having the discipline and mental toughness to do that kind of training... yeah, that's
"hard".
We should take a poll, I bet less than 1% of the people here can do 25mph in a 10-mile TT...