Hey skiers...here is the check list to try and get your breathing muscles ready for higher altitude-I recommend 2x/day
Stretches to increase mobility of ribcage (easier inflow and outflow) https://www.my-exercise-code.com/code/xr?u=WF4S&c=L6M7U7G
1. Respiratory diaphram stretch (you know this) -take a big breath in, exhale fully, place hands on knees so you are slightly bent over-after you have fully exhaled, pull your stomache up under your ribs, breathe when needed. Repeat 5X
2. get a straw, purse your lips around it-breathe deeply in then out, only getting air from the straw-focus on relaxed shoulders and expanding your lower ribs 15X-stop and breathe normally if you start to get dizzy.
3. Breathe in, exhale fully, then hold breath as long as you can (gets your body used to increasing co2 levels) -repeat 5x
4. Wear a buff over nose and mouth when skiing to add a bit of resistance to airflow.