The 15-Minute Lumberjack Workout That Builds Explosive Power and a Rock-Solid Core

Nearly every movement you do in the gym mimics something done in everyday life. Rotation, for instance, allows you to control your center of mass over your base of support while your body is in motion. You rotate through your torso when you walk up stairs, reach overhead, load groceries, or perform basic household tasks. Accordingly, it's important to train rotational exercises to maintain these movement patterns as we age.

If the muscles responsible for rotation in your core aren’t doing their job...