Democratic presidential candidate Robert F. Kennedy Jr. shared a video to Twitter Sunday which appeared to show the 2024 hopeful performing push-ups.

"Getting in shape for my debates with President [Joe] Biden!" Kennedy said.

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In the video, Kennedy is seen at an outdoor gym and bending over to start his workout, in which he completed nine straight push-ups before calling it quits.

"Americans gained an average of 29 pounds during the Covid lockdowns. I will help turn this around by encouraging our citizens to exercise, eat well, and fortify their immune systems, by removing harmful chemicals from our food," Kennedy wrote in a subsequent tweet. "So start doing your morning calisthenics everybody. Get yourself in shape for a Kennedy Presidency!"

The Democratic National Committee has already announced it would not hold primary debates this year, although Kennedy is one of two contenders in the running. Author Marianne Williamson is also facing off for the Democratic presidential nomination.

Eight in 10 Democratic primary voters want the president to debate Williamson and Kennedy according to a June USA Today/Suffolk University poll. It also revealed 21% are undecided on which candidate to vote for. Biden had 58% of Democratic support, 15% of Democratic voters support Kennedy and 6% back Williamson.

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Kennedy's video comes as a NBC News poll shows 68% have major or moderate concerns with Biden's mental and physical health related to his job as president. Only 32% have minor or no real concerns related to his health.

Biden is 11 years older than Kennedy.