French President Nicolas Sarkozy has left the Val-de-Grace military hospital in Paris, having spent the night there after collapsing while jogging, BBC reported.
Mr Sarkozy underwent a series of tests at the facility, but doctors found nothing untoward and said he would make full recovery, the Elysee Palace said.
The 54-year-old leader would now take a few days off to rest, it added.
He was flown to hospital after suffering a "minor" nerve complaint in the park of the Palace of Versailles.
The president, said to be on a punishing new diet and exercise regime, had gone for a run in hot weather and collapsed at around 1330 (1130 GMT), after 45 minutes of "intense physical activity".
The Elysee Palace denied he had lost consciousness, as suggested by earlier statements, saying he merely had to "lie down with the help of an aide".
A doctor who is with Mr Sarkozy at all times administered initial treatment and requested a helicopter to take him to hospital.