... that you can use for 10 to 12 reps. Dumbbell straight-leg deadlift ABThe Women’s Health Fast- Track Tone-Up PlanGrab a pair of dumbbells with an overhand grip, and hold them in front of ... the gym. And with less time than ever to exercise, you need a workout that guarantees results, fast. This fat-burning, muscle-toning workout re-quires only a single set of dumbbells—meaning ... knees slightly bent [A]. With your back flat and arms straight, pull both dumb-bells upward as fast as you can by thrusting your hips forward and explosively standing up. Keep the dumbbells...