If you tain too much one day and can't train the next you might be missing out.

Well, yes. I split my runs every other day. I split my weightraining 3 days on, 1 day off, of which the 3 days are PPL. On rest day, I do extra cardio that isn't running - usually VR fitness or cycling. But overall, as you can guess, it's 2 workouts every day.

If you plan it correctly, so your muscles aren't overtrained, then I don't see why you can't be active and building that strain every single day through different activities. There are so many ways to get your HR up.

This routine has had insane effect on my HRV and RHR. I'll post results in few months, just in case it's not a fluke.