Robert Pattinson had his gym clothes in hand yesterday afternoon following a workout in LA. He had the afternoon off after spending much of last week in the Ventura area getting down to work on Water for Elephants. He was the first on set looking hot and dirty, but Rob was later joined by his costar Reese Witherspoon for more filming. Reese some downtime, and she spent her Saturday bonding with her son Deacon and boyfriend Jim Toth. Robert's own special friend Kristen Stewart was nowhere to be seen, but he and she will be together next month when they present a sneak peek of Eclipse at the MTV Movie Awards with Taylor Lautner.