THURSDAY, July 22, 2021 (HealthDay News) -- To do their best, Olympic athletes need to be both physically and mentally fit, but the COVID-19 pandemic and its restrictions at the Tokyo Olympics has made that a real challenge, experts say."This Olympics is unprecedented," said Dr. Michael Lardon, an associate clinical professor of psychiatry at the University of California, San Diego.The Tokyo Olympics itself, which officially begins Friday, is pressure-packed. You train for four years to get there and you often have one chance — it's make or break. "Most athletes don't come back four years later, so making it to the Olympics is unique," he said.But this time around, the pandemic has put extra pressure on the athletes, said Lardon, who has been a consulting psychiatrist to the U.S....