Exercising becomes very difficult when you have an injured joint. Your movements become restricted and you can't exercise the way you like. Abhishek Chatterjee, Assistant Fitness Manager, Fitness First Mumbai, says that when you have an injured joint, you should aim at strengthening the muscles around the joint, so the stress on the joint is reduced. In case of an injured knee, it is best to avoid movements that forces the knee past the toe line. Here are some exercises you should avoid.