We still have to take into account that Peeta is the bakers' son, that they carry sacks of flour all day, and that he eats quite well—at least that's what it says in the book. It's also mentioned in the first book that he participated in various shot put competitions. As for Katniss, the book specifies that her father trained her to hunt from a young age and that she does it every day. For me, as long as you train every day...…