Get a old police bike with a frame made out of gas piping, 3 speed sturmley archer and with 28" wheels and do hill repeats on it
Then your modern, sub 20 lb, lightweight bike will seem like a feather
I agree. I don't own a bike that light, but then I don't race any more. My fixed is about 21 pounds or so before I put the saddlebag on, and that positively flies since the machines I routinely ride weigh more like 45 pounds.
"When I were a lad", in the 60s and early 70s our local fast men always rode heavy old clunkers for commuting and general club rides. There were tales about putting hot water bottles or bricks in their saddlebags for a bit of weight training.
MSeries comment about Ergo or STI is right. About 10 years ago I met somebody who had spent a lot of time and money making sure his club bike (not even for racing) weighed less than 18 pounds. He was not impressed when I told him he could save 8 ounces by fitting downtube levers etc. Apparently my thinking is all wrong.
Jesting apart - how much weight could you save? A few ounces, and that at tremendous cost. Leave your mobile phone at home and you will save the same weight - but there I go with my wrong thinking again.