Don’t over use the armrest and get up for a couple of min every hour.
Drink enough fluids so you’re forced to take bathroom breaks.
Even though you may feel like a prison rat in a wheel use the hotel gyms for cardio.
If the FAA ever got serious about BMI about 40% of you would need a serious lifestyle change or loose your medical.
Maybe we should go to Chinese or Japanese style astronaut medicals.
Pilot shortage back again....yea..!