6 Dangerous Exercises You Should Never Do
The Power Clean
Knee Extension Machine
Some trainers and fitness instructors encourage squats that bring the butt almost to the heels, claiming that going lower will build more muscle. But this move will also put extra pressure on your knees, says Tamilee Webb, star of the Classic Buns of Steel DVD collection. To stay safe, skip these deep drops and stick with a regular squat. "When doing a squat, the hips should not drop below the knees, the knees should not move forward past the feet, and the back should remain in a straight alignment," says Webb. If traditional squats still hurt your knees, try squatting with your back against a wall, keeping your feet about two feet in front of your hips so they're under your knees.