RFK Jr campaign promotes workout challenge for voters as Trump, Biden's fitness becomes issue in 2024 race

FIRST ON FOX – Robert F. Kennedy Jr.'s presidential campaign on Tuesday will begin promoting a new workout challenge for potential voters, as questions about former President Trump and President Biden's physical and mental fitness have emerged center stage in the 2024 election contest.

Championing his group of supporters at Gold's Gym in Venice, California, where he sometimes works out, Kennedy is unveiling the AmericaMoves challenge on Tuesday, encouraging participants to get up and get active for at least 24 minutes of movement a day to kick-start healthier habits for 2024.

With the help of influencers like Devon Levesque, the first human to bear crawl a marathon, and famed physician and author Dr. Mark Hyman, AmericaMoves "has set out to ignite a wellness revolution," Kennedy's campaign said in a statement to Fox News Digital, adding that the challenge is inspired by RFK Jr.'s own physical regimen.

It comes at a time when Democrat commentators and GOP presidential rival Nikki Haley jumped at the opportunity to criticize the 77-year-old Trump's mental fitness when he used Haley's name instead of then-House Speaker Nancy Pelosi's at a New Hampshire rally last week when repeating allegations Pelosi was in charge of security and turned down 10,000 National Guard troops ahead of the Jan. 6 riot at the U.S. Capitol.

Trump hit back at another rally that he feels, "my mind is stronger now than it was 25 years ago" – the exact age gap between him and Haley – and went on to call into question Biden's mental, as well as physical fitness, noting how the 80-year-old president has shorter public appearances and has shown difficulty finding out how to get off stages.

RFK JR. MEETS REQUIREMENTS TO APPEAR ON FIRST 2024 GENERAL ELECTION