<p>Gaining muscle and losing fat requires precision engineering. It should come as no surprise then that the Germans ? who brought us the diesel, engine, electron microscope, and Heidi Klum ? pioneered it.<br>According to legend, during the Cold War, an Eastern Bloc scientist defected to West Germany, where he conducted experiments on weight training for body recomposition. His team found that pairing upper- and lower-body exercises, performing m...