I'm not a doctor, so I just can say my anecdotal experience, take it like grain of salt. - Measure Vo2 max, and try to improve it monitoring it, there are some

I'm not a doctor, so I just can say my anecdotal experience, take it like grain of salt. - Measure Vo2 max, and try to improve it monitoring it, there are some things that just work better for vo2 max, like HIT, and specific protocol of max intensity and rest, for example 4 min intensity followed by 4 rest, 4 times is one of them. Better explained at this Rhonda Patrick's video [1] - Additionally I notice a big improvement when doing hikes in high altitude, I did vomit few hours after coming down from Teide mountain, hiked from tele-spheric station up to 3200mts. I think I over did it for my fitness level, and didn't protect from sun properly, but after recovering I could feel a big improvement in my usual walks, and Apple Watch showed and increment of Vo2 bigger than usual. - Also this is more specific, and probably does not apply to you, but check your hormones. Because lack of sleep and stress, I had ACTH, Estradiol, Prolactin and Homa-IR out of whack, was nearly developing type 2 diabetes, fixing this made losing weight so much easier, and gym sessions way less tiring. - [1] https://youtu.be/IxYdkMmtjBs?si=NbSBryghetTA5LE4 https://youtu.be/IxYdkMmtjBs?si=NbSBryghetTA5LE4