Donna Mills is showing there’s now slowing down when it comes to staying fit. The former Knots Landing star, 85, revealed the rigorous routine that keeps her in tip-top shape weeks after launching her OnlyFans account. Mills told Fox News in a new interview published on Saturday, September 5, that she builds her abs by doing cardio and reps including 100 sit-ups a day, 50 leg lifts and stretching. “I have a ballet barre in my little gym,” she added. “And ride the bike for about 45 minutes or an hour. I play tennis five times a week sometimes. And so that’s very, very import...