President Donald Trump has been declared in “excellent health” by the White House physician following his third known checkup since he returned to office last year.  Trump, the oldest President to take the oath of office, was also advised to increase physical activity and lose weight after gaining 14 pounds in just over a year.  The three-page report, authored by White House physician Dr. Sean Barbabella , detailed the results of Trump’s physical exam at Walter Reed National Military Medical Center earlier this week, as the President approaches his 80th birthday next month. Trump has "strong cardiac, pulmonary, neurological, and overall physical function" and is "fully fit to carry out all duties of the Commander-in-Chief and Head of State," the report reads. He underwent extensive physical and mental tests, according to the report, including an echocardiogram, an ultrasound of the carotid arteries, examination of the lungs and eyes, screenings for anxiety and depression, and blood tests.…