1) How Queen Elizabeth rides 2) On or as if on a sidesaddle 3) One way to ride 4) One way to ride a horse 5) Saddle 
Sidesaddle riding is a form of equestrianism that uses a type of saddle which allows a rider (usually female) to sit aside rather than astride an equine. Sitting aside dates back to antiquity and developed in European countries in the Middle Ages as a way for women in skirts to ride a horse in a modest fashion while also wearing fine clothing. It ...
• (n.) A saddle for women, in which the rider sits with both feet on one side of the animal mounted.
(from the article `horsemanship`) Though now not so fashionable, the elegant and classical side-saddle seat was formerly favoured and considered correct by many horsewomen. On the ...
Side'sad`dle noun A saddle for women, in which the rider sits with both feet on one side of the animal mounted. Sidesaddle flower (Botany) , 
[adv] - on or as if on a sidesaddle 2. [n] - a saddle for a woman
adverb on or as if on a sidesaddle; `she rode sidesaddle`