A

Stand holding a dumbbell in each hand, arms by sides, palms in, feet hip-width apart, toes pointing straight ahead, legs straight but not locked. With abs contracted and torso centered, take a long step forward with left foot, bending both knees so left knee aligns with left ankle and right knee points toward ground, heel lifted (shown). Push off right foot, straightening both legs, then step forward with right foot, bending knees into lunge. Continue to lunge in a forward-moving pattern for all reps on each side.