Sen. Dick Durbin (D-Ill.), who announced his retirement from the Senate on Wednesday, said during a Thursday morning ...

It's painful, physically and mentally. It's not as easy as walking out the door and if it was I would've done it a long time ago. When I'm in pain, the pain gets so bad that it's physically crippling.

You also don’t need extra equipment, meaning you can usually just walk out the door and go. “Walking is great because it’s a cardiovascular exercise, but it’s also weight-bearing ...