This is from one of the 1950s Evinrude "How to Book of Water Skiing" brochures I made a couple of the vintage skiing posters I've got on SIA from. Not only does the book teach you how to ski, slalom, build a ramp, jump, do tricks and general boat safety, it also totally teaches you how to make the moves on the water ski babes. All in 10 fact-filled pages. Great book.
If only I had known it was that easy to impress the ladies.
I'm also quite impressed that you could pull four "average" girls on skis with a 35 hp outboard or one 150 lb skier with a 7.5 hp o.b. They must've had a lot stronger horses back then. Maybe it was just the lead they used to put in the gas.