Better make this clear, guys. Lancaster UK is a bit cooler than the "other" one. And once the temp gets up to 70 the top comes off anyway (might be the only opportunity this year!), although we have had some stifling days in Augusts past. . . . . .not yet though.
As for the sweat, well, I've noticed since writing this, that cotton tops show sweat readily wheras the wicking stuff being man made, tends not to. It's no less comfortable however.
I tend to drink no water during the 45 minute session, although on occasions I have.

I've never been aware of sweat like this, but then I've never been pushed so hard over that short time. Never, in my life. It's addictive.

I'm kinda wondering if short sharp bursts are the way ahead for older guys, you know. Four or five times a week doing this and I'll markedly lower the odds of getting knocked off my bike anyway since serious road rides will be seriously curtailed. . .and I feel a lot better/livelier too. Just a few thoughts.

I might be in the wrong place to exercise them . .