Scott,
That’s great to hear.
Reading up on Maffetone Method had me thinking that during lengthy aerobic session if you significantly popped up above your aerobic threshold HR (roughly 180-age) into anaerobic, especially at the end, that you could derail your body getting the full effect of that aerobic conditioning response to that latest aerobic session.
IOW’s, if last effort was anaerobic, response would then become more so, too, even if anaerobic effort was only a fraction of time compared to much lengthier earlier aerobic.
Not so, I’m hearing you say, yes?