HAVANA (AP) — American Diana Nyad endured several jellyfish stings as the 62-year-old endurance athlete sought to become the first person to swim unaided from Cuba to Florida without a wetsuit or a shark cage.

A team member posted on Nyad's Twitter account that the American was steadily stroking onward early Sunday despite jellyfish stings to the lips, feet and legs. Her goal: to become the first person to set a record 103-mile unaided crossing of the Florida Straits.

"There are so many jellyfish," said one of the tweets, adding, "Diana is swimming backstroke right now leading with the cap-covered part of her head to minimize contact."