A 13.1 mile run is a huge challenge, and this year organisers expect as many as 5,000 people to take part.
But just what restrictions are in place over who can get involved?
Well there aren't many - but one rule that does apply is the age restriction.
Runners taking part in the Belfast City Half Marathon must be aged 17 or over on September 22 2019.
All participants must complete the route in less than three hours.
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