I've recently had a shocking change of heart as a runner: I no longer dread the treadmill. What changed? For one, poor air quality has left me no other choice. And secondly, I stopped using the ...

Q I am an 85-year-old man with congestive heart failure. I have almost totally lost my balance. My treadmill quit working and my daughter, a physical therapist, thinks I do not need to replace it. She ...