Originally Posted by
dahut
Zone Four intensity? It even sounds rough. Wassat?
PS I went and looked that up. It means working really hard for as long as you can, until you nearly give out. Right?
There were an awful lot of calculations, discussions of heart recovery rates and lactase in the blood - but this suffices.
Not quite that hard, but nearly so. The reference I use is "race pace". The end result is that when I get off the bike I go, "Wow! What a workout!", as opposed to, say, "Lizbeth, I think it's the big one!"