Stand with dumbbells grasped to sides facing side of bench.
Place foot of first leg on bench. Stand on bench by extending hip and knee of first leg and place foot of second leg on bench. Step down with second leg by flexing hip and knee of first leg. Return to original standing position by placing foot of first leg to floor. Repeat first step with opposite leg, alternating first steps between legs.
Keep torso upright during exercise. Forward knee should point same direction as foot throughout movement. Stepping distance from bench emphasizes Gluteus Maximus; stepping close to bench emphasizes Quadriceps.