One of Rides a Bike’s earliest photos, here’s Kathleen Key doing some indoor cycling at home. It’s 1925 and the Silent Screen player has the role of Tirzah opposite Ramon Novarro in MGM’s Ben-Hur: A Tale of the Christ. The “fashionable slenderness” caption on the back, in full: “KATHLEEN KEY— Bicycle riding is the latest fad Hollywood has instituted for those who would have fashionable slenderness. Kathleen Key, Metro-Goldwyn-Mayer actress, first to sponsor this latest fad, who is shown here exercising on her trusty bike in the gym of her home before going to bed, says that this form of exercise takes off unnecessary fatty tissue from hips, thighs and abdomen and gives one the straight, boyish lines so fashionable today. “Bicycle riding,” says Miss Key, who plays a feature role in M-G-M’s “Ben Hur,” “hardens the muscles of the thigh and abdomen and is one of the best exercises I know of for acquiring and maintaining the fashionable slender form.”