Hi S Gretchen Johnston. There are a variety of reasons why your hips may crack or pop. If pain accompanies the cracking/popping, it could be an indication of an injury. If this is the case, please seek medical advice. If there is no pain, cracking or popping of the hips can be due to bones rubbing together, or that the bones of a joint are fixated. Some ways to alleviate this popping can to be strengthen your hips and increase their range of motion. I've attached some videos that may help.

If the popping gets worse, and/or you are feeling pain in your hips, please speak to your doctor before continuing with any more exercise programs.