@helli, that is not my experience. We regularly tell each other that we are all different and I suspect that you and I have very different fitness levels. In former years I have been extremely fit, alas in the last 5 years I'm now constrained more than I like by health issues (and age).
My references would be from my personal experiences in the last 4 years and supported by various articles I read during 2021 and through into 2022. At that time, with my newly provided CGM (Libre 2), I was trying to make sense of how to adjust my bolus doses to accommodate forthcoming exercise and activity. Before that time I knew nothing about insulin dependence and on MDI with only FPs I was really roller coastering from some deep and lengthy hypos rapidly into hypers in the 20s. That "before CGM" period was pretty miserable at times.
The DUK online T1 Conference in the autumn in (I think) 2022 further informed me; a particular speaker gave his presentation on Exercise and Activity. I have the notes I scribbled down at the time - but these are still in storage (due final release for good behaviour, next week). But they may not see daylight for several weeks; so much else to be unpacked and placed.
And in my experience a full on Cardio workout is as intense as I can manage these days. This will (does) quickly raise my BG significantly; it does eventually drop (crash usually unless I anticipate it properly), but I attribute that speed of fall directly to my total pancreatectomy and consequent brittleness of my D.
Steady walking works best for me and I can happily walk most of a day. That gives me a degree of control (ie reasonable BG management); I still need to adjust my bolus dosing for such days and can often make a 75% reduction of bolus for that post activity meal. Mowing my own and my daughter's lawns (a few houses away and hers is on 3 levels) is my equivalent of a full gym workout; I invariably regret taking that on, since it just plays havoc with my BG management.
However my intention in that post was to encourage
@Newbie777 to return to some exercise and fitness training as soon as practical for him. And to not overdo that exercise after many months away from the gym. It may well be I could have added to those particular words with "this works well for me". However, having read my post again I think my immediate subsequent sentence:
"
Once again I caveat my remarks: we are all different and what works for one person may not work for another"
goes some way towards that objective.
This has been a relatively fast moving thread, with now 50 posts in some 30 hrs and I've had to erode my beauty sleep to get this reply to you, before I step away for a while and look to where (and how) we are going to stow everything coming out of storage on Monday! At the very least in the coming weeks there will be multiple "Hanging Committees" needed to be commissioned, for the final detailed approvals of each picture's next resting place. Busy weeks ahead.