By Tanner Garrity There have been enough dramatic Marvel transformations by now that it’s common to hear people explain how “easy” it must be for A-listers to get shredded. With a team of dedicated trainers and nutritionists, plus endless free time (the thinking goes), of course these actors are getting into the best shape of their lives within a span of months. But that rueful presupposition ignores the fact that leading men and ladies spend a massive portion of the year on the road, catching long flights, sleeping in unfamiliar beds and walking from one press junket to another. That’s not to…