For the Love of Running Ivonne runs tethered to her husband, G. John Schmidt. She sets the pace, while he warns her of any changes in terrain, elevation, and direction. When Ivonne started running in 2001, her friends reinforced her with hot chocolate. These days, she doesn’t need sweet treats to keep her coming back. The pleasure she derives from running is reinforcement enough.

MICHAEL S. WIRTZ/The Inquirer/Daily News/Philly.com