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Standing with your feet shoulder-width apart and your feet in line with another, stick your butt out backwards. Hold a weight in each hand, letting your arms stay to your sides. Moving slowly, squat downwards while keeping the weight square to your chest. Move downwards until at a 90 degree angle. Hold briefly, and using your butt muscles, clench and push back upwards. Try 3 reps of 15.  When squatting, keep your weight on your heels, rather than tilted forward on the balls of your foot. Always keep good form when squatting. It’s important to keep your back straight and chest open, rather than slumping over into poor posture. Keeping your back straight keeps your legs engaged and your butt working hard. If you feel good about squats, try amping up your reps or the amounts of exercises. Another options is to hold at the sitting-stance of the squat. Pausing at the most difficult part will aid in strengthening, and in turn, enlarging, your butt muscles. Don’t have a set of dumbbells? Don’t find an excuse to skip this exercise. Use things in your home to keep you in tip top shape. For example, a milk jug filled with water and tightly closed can act as a decent sized weight. To amp it up, try filling your jug with loose change.

Summary:
Drop it low with a weighted squat.