Fitness modelling. How do you get into it??

[silverback mike]

Hi all.
Now, I hasten to add this isn't a request for myself. It is in fact for my son, who's now 18.
He's often been told he should look into this malarkey, he obviously has his mother's looks which isn't bad thing, and due to his love of sport especially gymnastics and swimming has the physique too.
But as this has never crossed my thought process ever, nor my boys....
How do you get into it! !!!
Help please gratefully accepted!

[silverback mike]

Thanks folks. Inputs much appreciated. His plan is not to make it a career, he's polishing off his A levels to move on but would like to make some money to fund his motorsport plans...