Play tennis is not good for a mechanical watch.
Breitling have a system which setting the date at any time do not ruins the mechanism. Do not try! Read the manual first if you have such a Breitling.
The 7 sins.
My guide to handle a watch are:
Be careful.
Do not smash your watch rude on a table.
Set date only at 12:00 at day time. Control if the date wheel is not at action if it is before midnight.
Avoid water much as can.
I never clean a watch doping it in water or soaped water.
Keep your watch away from animals.
Never wear bracelets, wrist bands, that can damage a watch case and scratch watch glass.
When painting, making chairs, pulling furniture, do not wear your sunday watch.
Never give a watch dummy a mechanical watch, they do not understand what a mechanical watch means, works.
An expensive mechanical watch is a delicate peace of art (we all know)
Cheap watches are great to wear when you want keep your treasures in perfect condition for the moment you want to enjoy the fine things in life.