His sister, Her Royal Highness Princess Anne, Princess Royal, is seen as more stronger. Oh well.
http://www.telegraph.co.uk/news/uknews/theroyalfamily/11804417/Princess-Anne-is-the-best-of-us-tough-practical-hardworking-dutiful-and-undemonstrative.html
Princess Anne likes horses too. I’ve never seen the Queen happier than when riding a horse.