Go sleek in the knees with a burn and firm fix. Drop excess body fat with a mix of diet and cardio to trim glab all over and "make it easier to see the stronger muscles around the knee," says FITNESS advisory board member John Porcari, Ph.D., professor of exercise and sport science at the University of Wisconsin-La Crosse. Then build your quads. "Sagging happens when skin isn't being supported and shaped by underlying muscle," says Jerzy Gregorek, head weight-lifting coach at the University of California, Los Angeles. "Instead of a traditional squat, bend at the knees as if you were about to kneel; this works muscle fibers near the knee better."