I am 82. I have various ailments such as BPH and spinal stenosis. I try to do a Dailey workout that consists of warm-ups (based upon Japanese philosophy) , floor exercises that focus on the core of my body and legs and then about 15 minutes on the treadmill. Stretching is important....That keeps me going although I do have back pain when I walk , I just tolerate it. Always looking for other ways to keep physically active.