When Robert F Kennedy Jr ran in the 2023 Democratic primary, he shared a topless video of himself doing push ups, urging his supporters to get “in shape” for his impending presidency.

In the two years since, he may have changed political parties, but the 71-year-old’s penchant for showing off his physique has not changed - nor his unusual habit of wearing jeans to the gym.

The US health and human services secretary (HHS) is fronting a new White House fitness challenge alongside Pete Hegseth, the US defence secretary.

The two politicians competed in what they have dubbed the “big, big Pete and Bobby challenge, which sees participants perform 50 pull ups and 100 press ups within five minutes respectively, at the Pentagon Athletic Centre.