"I've been writing a book called Prime Time: Creating a Great Third Act, ... and in the research I did, it was clear that one of the most important things is to stay physically active," Jane says. "Not just for your body and your muscles, but for your brain."
Watch Jane demonstrate two exercises for baby boomers and seniors.
"It's not marathon stuff," Jane says. "It's very doable."
Jane's workout DVDs came out on November 30: