Admiral M wrote:
Why? Glenn Close would make a better Aquaman than Phelps, what makes you think he would be a good choice?
Because he could do all his own stunts, and he really is a superhuman swimmer.
But he's not an actor
. And even though he may be able to do all his own stunts, they wouldn't let him; if the main actor gets injured doing a stunt, the movie is held up for months while he recovers.