Aerobic Workout Warming up

As we age, joints lose mobility, tendons stiffen, and muscles shrink. As muscle fibers decrease, they can take longer to respond to stimulus, making injury more likely. Warm up and cool down every time you exercise to reduce risk. Before exercising, spend 7–10 minutes warming large muscles and lubricating joints: shrug and roll your shoulders; circle hips, wrists, and ankles. Bend and straighten your legs a few times. Then add in larger movements that raise the pulse and increase circulation to muscles. March on the spot, swinging your arms, for example.