10/08/2009 AT 07:30 AM EDT
Levi Johnston has laid bare life with the Palin family
. Now he's about to expose much more – himself.
Rex Butler, a lawyer for the 19-year-old father of Sarah Palin's grandchild
, says it is a "foregone conclusion" Johnston will pose nude for Playgirl
and is now getting gym-ready three hours a day, six nights a week, working out with an Anchorage body builder, the Associated Press reports.
The trainer reportedly is Marvin Jones, a former Mr. Alaska competitor who has prescribed a low-carb, high-protein diet for Johnston, whose date to disrobe before the camera has not yet been determined – though Levi's full monty is expected to go online before the end of the year. Playgirl
made the approach to the budding media celebrity
(who stars in a new nut commercial
), said his attorney. "We told him he would have to do what actors and actresses do. They get in the gym," said Butler.
rep Vincent Stevens could not be reached for comment. Palin's spokespeople did not respond to a request for their take on Johnston's upcoming photoshoot.