"Human movement can be reduced to three basic categories: pushing, pulling, and hip extension (squatting, jumping, running, and even riding a bike)," writes Daniel Duane in this month's Men's Journal. "Functional fitness begins with learning good form for this essential repertoire and then gradually adding weight and difficulty to build stability and strength." The piece outlines eight exercises to quickly and effectively get yourself into fighting shape, from overhead kettle bell presses and swings to classic push-ups and lunges.