While the exercises in this article provide alternative exercises to do in place of lunges, there are many variants of the exercise that may allow you to perform them. For example, instead of a walking lunge, you could try reverse lunges in place, working the same muscles while requiring less balance and coordination, and placing less stress through the knees. You could also perform your lunges near a bar or wall for support, using your upper body for balance and maybe even to help pull you up a little while you build leg strength.