Kristen Stewart was back on the horse at a ranch outside of LA yesterday. Kristen has been enjoying riding lessons and is also taking regular yoga classes as she gears up to play the lead in Snow White and the Huntsman. The movie will give the classic damsel in distress a new butt-kicking persona and pairs Kristen with Pirates of the Caribbean: On Stranger Tides's cute star Sam Claflin. Despite the workouts, Kristen visited the Cosmopolis set around the July 4 holiday to see her real-life leading man, Robert Pattinson, who has been shooting the new film in Toronto for several weeks. Rob and Kirsten's big-screen commitments are keeping them apart right now, but the couple will get the chance to reunite for work when they team up to promote the highly anticipated Nov. 18 release of Breaking Dawn Part I.