CNN anchor Jake Tapper wrote a column attacking RFK Jr. over a 'false story'
The criticism comes as remarkable video emerged of RFK Jr. working out in CA

Democratic presidential candidate Robert F. Kennedy Jr. shared a video of him doing push ups outside the legendary Gold's Gym in Venice Beach - as he called for a debate with Joe Biden.

Accompanying the video was the caption: 'Getting in shape for my debates with President Biden!'

His tweet comes as other videos began to surface of the 69-year-old lifting weights at the same gym, which is dubbed 'the Mecca of bodybuilding'.

RFK Jr has long been saying he wants to debate Biden but the White House has largely ignored those calls -  a recent poll indicated the majority of Democrats wanted to see a debate.

'So start doing your morning calisthenics everybody. Get yourself in shape for a Kennedy Presidency!' he wrote in another tweet, and also addressed the fact he was only recorded doing nine push ups.

'And yes, I can do more than 10 pushups. That was my last set,' he said.

It comes after CNN anchor Jack Tapper published a column accusing him of telling a 'wild and false' story about an interaction they had in 2005.