Zac Efron was decked out in his exercise clothes yesterday while out running errands in LA. The actor, who has been looking extra muscular lately, arrived back in California a few weeks ago following a stint in Louisiana working on The Lucky One. He brought his fine form out onto the red carpet at Sunday's Golden Globes, and later made an afterparty stop at the InStyle bash. He stopped to speak to press at the big Hollywood event and confirmed that he will be sharing scenes with Michelle Pfeiffer in his upcoming film New Year's Eve, but he couldn't say if their matchup would be of a romantic nature. He also didn't address rumors about his personal life, not giving word about whether he and alleged ex Vanessa Hudgens are back together after all.