It was a beautiful summer day, but Laurie could feel the tension in the air as she anticipated her opponent’s next move. Whack! She sprinted towards the net, stretched out her racquet, and smashed the ball, sending it past her sister for the final winning point. She smiled, red-faced and out of breath. I’m only 34, she thought as she chugged her bottled water. I shouldn’t be this exhausted from a pick-up tennis match! Her older sister, Patricia, gave a knowing smile and shook her head as she dried the sweat beads from her neck with a towel. “We are so out of shape!,” she called from across the court.