Side-saddle means riding with both legs on the same side. Ride side-saddle.
It was required of women for centuries and needs a special saddle with two pommels. Riding side-saddle is harder rather than easier, which is the opposite of what people assume.
1adverbside-saddleRiding with both legs on the same side.
“She could jump a five-bar gate side-saddle.”
side-saddle is a manner.
sidesaddle comes from side + saddle.
Etymology from Wiktionary, CC BY-SA
Practised in Horses & Riding