Skeptics say squats cause excessive pressure on the knees and put intensive stress on the back. But this bad reputation is largely unwarranted.
Any exercise done incorrectly can cause injury.
If you perform squats with correct form, they may be the best exercise you can do for your legs, hips and glutes. You don't have to be a bodybuilder, power lifter or daredevil to do squats. It's a good idea to consult a physician before you undertake any weight training or other exercise program, especially if you have existing health problems or if you haven't worked out in a while. Squats can be done with or without weight. If you've never done a squat before, then start without any weight until you perfect the proper technique.