This photo is from a network series entitled The Battle of the Network Stars that aired in 1976. The show focused on competitions between stars from different networks. It was awesome to see different celebrities challenge each other in ways you never would have expected. This photo is of Lynda Carter during her stint on the competition where she competed in swimming against other celebrities. She was training for the show while she was working on Wonder Woman, so she would wake up at 5am so that she would have time to film later in the day.
Despite her best efforts, Lynda Carter got third place in the show. Nowadays, instead of putting celebrities against each other, there are reality shows where humans take on bears in physical activities. It makes you wonder what's next.