Apple

Hi everybody. Apple Watch SE2 owner here. Ever since i started training muay thai one month ago my vo2 max and cardio recovery have dropped from above average to below average(I am 21). It doesn’t make any sense to me because my vo2 max has always been above average and should be even higher since I started training muay thai. Even before starting muay thai I was pretty active individual(4,5 gym sessions a week,above 10000 steps everday). I don’t wear my watch during muay thai training and I put it immediately on after training so maybe that has something to do with it. Any type of help would be appriciated,thanks.