You don't have to go high-impact to get good results.
There’s no question that high intensity exercise burns mega-calories in minimum time. But when that high intensity comes in the form of running, jumping, and sprinting, you’re only as strong as your weakest link—and for many that means your hips and knees, which are more vulnerable to injury as impact levels rise.
“Stress and impact are amplified with high intensity training routines and sudden force can cause damage to joint cushions, tendons, and muscles,” says Nicholas DiNubile, MD, orthopedic surgeon and best-selling author of the FrameWork series of books. “This is especially true as we age, or if you’ve had previous injuries, as your musculoskeletal frame is not as durable or limber."