'Good genes': Trump undergoes annual medical exam

President Donald Trump, who delights in confounding health experts with his junk food cravings and disinclination to exercise, will undergo an annual medical checkup Friday.

The Marine One helicopter will take him to the Walter Reed National Military Medical Center in the Washington suburb of Bethesda for a full four hours of prodding, poking and testing, the White House said.

It was not clear how many of the results would be made public or when, but last year everything from the president´s cholesterol levels (high) to weight (too high at 239 pounds (108 kilograms) was released.

Trump´s then chief physician, Ronny Jackson, also held a press conference in which he declared Trump to be in "excellent health." Jackson, a navy rear admiral, has since run into trouble over alleged ethical misconduct and a different team will assess 72-year-old Trump.

On the plus side, Trump doesn´t smoke and is a noted teetotaler. He says he´s never even had a beer.

Less good: the former real estate tycoon and reality TV performer unashamedly embraces the couch potato life.

Not for Trump the basketball sessions that Barack Obama sweated through in the White House, or the bike rides of George W. Bush.

Trump loves the more sedate game of golf, but rides a cart between holes and has said that anything more strenuous is actually bad for your health.

"All my friends who work out all the time, they´re going for knee replacements, hip replacements -- they´re a disaster," Trump told The New York Times in 2015.

Trump has described his chief exercise as walking around the White House compound and standing up at public events.

The 45th president´s diet, reportedly involving legendary amounts of Coke and red meat, also seems to defy most doctors´ orders.

In January, Trump hosted the strapping athletes of America´s champion college football team, the Clemson Tigers, with a mountain of hamburgers and pizzas.

According to Jackson last year, Trump´s secret is genes.

"Incredibly good genes," he said. "It´s just the way God made him."