Plyometric exercises are explosive movements (popular in boot camps and other high-intensity types of training) that typically involve jumping or performing a strength-based exercise while also increasing heart rate. These types of exercises are meant to maximize power in a shorter interval of time. Squat jumps, lunge jumps and burpees are a few examples. These exercises are certainly efficient and have been applauded for their ability to accomplish a lot of work in a short interval of time. However, if you are over 50 there is reason to be wary of performing these exercises often. Without the proper muscle mass to support the explosive movement, a plyometric exercise can put a tremendous amount of stress on bones and joints. This can increase your risk for injury.