Hey, i was wondering how i can hold my breathe for longer underwater! i've tried running and some workouts, but there hasn't been much improvement. I can stay under for almost 40 seconds, but when i'm physically working, like swimming around the whole time, i can only stay for about 30 seconds, or a little less. Any suggestions? I'm also VERy new to free-diving, so if there are techniques or training stuff i could use to start, that would be much appreciated