I'm a personal trainer — try the old-school 'Run the Rack' dumbbell method to increase lean muscle growth

The 'Run the Rack' dumbbell method involves performing reps of an exercise to failure using each set of weights in the rack. Here's how it works.
CNN

Americans have changed the way they exercise. Here’s how gyms are adapting

Planning to hit the gym during rush hour? You’ll have much better luck finding an open elliptical machine than a bench press, squat rack or 30-pound dumbbells. Strength training — also called weight ...