Why this doctor became a personal trainer

I have a huge passion for preventive medicine, and balance my acute care hospital work with an outpatient wellness clinic.
I have always been into exercise and outdoor activities since a young age, but only became a regular gym-goer after I finished my medical residency training.
I also became very keen on learning more about healthier nutrition habits.
I don’t think I was as into this as I should have been when I was a medical student; and, in the immediate few years afterwards, my BMI and other lifestyle habits were heading in the wrong direction. My energy levels were also not where I wanted.