View full size image. Earth, the third planet from the sun, is the fifth largest planet in the solar system; only the gas giants Jupiter, Saturn, Uranus and Neptune are bigger. Earth is the largest of the terrestrial planets of the inner solar system, bigger than Mercury, Venus and Mars.
Video: Squat exercise. Dr. Laskowski: The squat is a body resistance exercise that works the leg muscles. Specifically, the squat targets the quadriceps and the hamstring muscles. Strengthening these muscles can help protect your knees and boost your performance in a variety of sports.
How to Do a Common Squat Exercise. Squat exercises are great for a total lower body workout. They effectively work most of the major muscle groups of the butt, hips and thighs. Squats are also a versatile exercise. They can be done in almost any location, with or without the use of weights or equipment. Squat exercises thoroughly engage the quadriceps, hamstrings and calf muscles, which helps to tone and strengthen the legs. Slowing the motion down makes the workout that much more intense. Doing squats gives the glutes a powerful workout, helping to tighten and lift the butt.