How intense was Weatherly's workout? ''Try to swim with all your clothes on and take somebody all the way up to the surface who's supposed to look like they're dead,'' Farnsworth says. Then imagine doing that for multiple takes. ''I noticed on some of the shots, [the actress] would run out of air, so she'd start to kick her feet to go a little faster,'' Farnsworth adds, with a laugh. ''You can't use that one, of course.''

Next Photo