By Janet Lee
Targets legs, butt, and core
Stand with feet hip width apart, holding a dumbbell with both hands in front of chest, elbows bent.
Lunge forward with right leg, bending right knee to 90 degrees, being careful to keep right knee aligned with right ankle (shown).
Push off floor with right leg to return to starting position, then immediately step back with right foot and lower into a reverse lunge to complete one rep.
Do six reps, then switch legs and repeat.
Too easy? Don't step feet together between lunges.