Question: I am obese and knees sound like they're cracking when I try walking lunges...any suggestions until some weight comes off?
Answer: The cracking sound in your knees sounds scarier than it is. Here is a recommendation until you feel comfortable with doing walking lunges. I would start with a 5 minute walk on the treadmill to make sure your muscles are warm. Then stretch your legs out to get your quadriceps and hamstrings loosened up. Try doing stationary lunges until you build up enough strength for walking lunges. Standing straight step one leg backwards (reverse lunge) and then push up with your front leg. This will be safer until you build up more strength to support your knee joint.