6. Weighted lunges False: Your knee is turned sideways, which is painful and useless.Right: When stepping forward, your knee must be 90 degrees bent and in line with your foot. Post navigation 10 Common Mistakes People Make When Trying to Lose Weight 6 Scientific Pieces of Advice to Get Rid of Wrinkles 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15