It doesn’t really matter what some productivity guru or fitness guy or gal does when they wake up. Cold plunge, sauna, getting natural light – it all depends on so many factors. You can perhaps take some good ideas from some of the better routines, but recognize that it’s non-fungible.
Money is fungible. A dollar is a dollar is a dollar. Any dollar is fundamentally interchangeable with any other dollar. You don’t care that the serial number is different.
Morning routines are not fungible. You can’t take all the things someone else does and just plug them in to your life and expect the same result. Often the morning routines people have now that they are successful are not the routines that made them successful.