Pear-shaped ladies often worry that doing squats and lunges will make their butt and thighs bigger. Not necessarily so! Those two exercises, as well as intense lower-body cardio like biking up steep hills will build those muscles. But if you squat and lunge with light weights two to three times a week with light weights, you'll firm your butt and legs without loads of bulk. Add to that 30 to 60 minutes of fat-blasting cardio most days of the week and you'll get leaner all over, leaving you with a lower half well worth showing off.