And why Prince George and Princess Charlotte are already learning.
Why Kate Middleton Doesn't Ride Horses
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Apparently there is one foolproof way of determining whether or not someone was brought up royal or married into royalty: horseback riding.

According to biographer Marcia Moody, although Kate Middleton may now be a duchess, there’s one thing that sets her apart from her royal family. Growing up, she didn’t learn how to ride horses.

Her husband William and brother-in-law Harry are both avid polo players and even 91-year-old Queen Elizabeth still rides, however the duchess does not partake in family horseback outings “purely because she didn't do it growing up.”

Prince William Plays Polo
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However, the duchess isn’t missing out on too many opportunities. Moody told Town & Country UK that, “William and Harry were taught from an early age, but the only time they ride now is for polo — they don't go off on hacks like the queen always has.” The Queen can still be spotted going for horseback rides through Windsor Great Park.

But Middleton is making sure that both of her children have a proper royal upbringing. Both Prince George and Princess Charlotte (ages three and two) have already begun their horseback riding lessons.

Kate Middleton at Polo Match
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Apparently Charlotte in particular has taken a liking to horses. Last year, the duchess told equestrian triple-gold medalist Natasha Baker that Charlotte “has this passion about horses and although she doesn't echo it, she'll do her best to champion and encourage it,” Baker told the Mirror.