Sadly, fitness does not work by the property of osmosis. Sitting next to an Adonis on the bus does not turn us all into museum-worthy Greek statues. It is a tough reality that means there is plenty of work out there for personal trainers. Still, the osmosis theory dies hard: personal trainers often face “pressure to look as fit as … clients hope to be,” says Nkem Chikwendu, a trainer at the JCC in Squirrel Hill.