Health: In reply to your original question, most of the sudden health related deaths we hear about are heart related. Even if one has no heart condition, it’s good to have an EKG done if there are risk factors. And don’t sit too long on a plane or otherwise. MOVE!
Of course, keep your weight in a healthy range and exercise most days of the week. (If you’re overweight and aren’t successful on your own, see a dietician.) But start exercising slowly, don’t suddenly shovel heavy snow or dance vigorously at a close one’s Chasunah. Even happy times have their stressors, so be extra vigilant about your health then.
Don’t smoke or do drugs and drink in moderation. No binge drinking! (These are my general recommendations for everyone, definitely NOT personal to Health.)
If you think you might be having a stroke or heart attack, call or have someone else call Hatzolah (unless you’re somewhere they don’t cover) not EMS. Know the signs and don’t stall.
If you have any medical concerns or questions, see a doctor – don’t rely on Google.
Have an annual or bi-annual physical based on your (competent) doctor’s recommendation, and do any follow-up testing required.
Don’t forget about your teeth either.
Which brings me to – guard your tongue and honor your parents (if still applicable).
Most importantly, Daven! Don’t obsess about your health, in the end we can only do our hishtadlus, but He’s the One in charge.