Hello, @jef & @Oscar Thanks ! Yes this was also my guess. I think I'll now focus on OA for a while, at least for 4 to 8 weeks. Indeed, from what I read, this seems to be the standard duration to notice some of the effects. I'll keep the cold exposure (showers, etc...). Plus it can also be interesting to do these without any breathing preparation. Fortunately, jumping rope is not really an issue beacause I practice it almost every day, during both my daily routine, and then 3 additional times during the boxing sessions. To a certain extent, I think the "pattern" is now well in my brain. I wanted to take advantage of it by counting the rounds to practice the intermittent breathing Kind regards, Pet'