How does a sport get added to the Olympics?
Through a process that has changed substantially — from a slow, permanent-programme model to one where host cities propose additional sports for their own Games, which has made the programme far more variable.
The old model. Sports applied for recognition, then for inclusion, and the programme changed slowly. Once in, a sport tended to stay, and the total grew steadily — which created a problem, since the Games were becoming unmanageably large.
The constraints the IOC works within. Caps on the total number of athletes, events and officials, imposed to control cost and complexity. This means the programme is close to zero-sum: adding a sport generally requires reducing another, which is why inclusion decisions are contested and why sports have been dropped.
What a sport needs first. Recognition by the IOC requires an international federation that complies with the Olympic Charter and the World Anti-Doping Code — the anti-doping requirement is absolute and has genuinely blocked sports.
The criteria applied: global participation across continents, youth appeal, gender equality, governance standards, value to broadcasters and audiences, and whether the Olympics would be the sport's pinnacle event. That last one matters — sports whose athletes regard another competition as more important are viewed less favourably.
The Agenda 2020 change. Since then, organising committees may propose additional sports for their own edition, if those sports are popular locally or globally and fit the constraints. This is why recent Games have introduced sports that then disappear and sometimes return.
Skateboarding, sport climbing and surfing entered this way; baseball and softball returned for one Games and were then absent; and breaking appeared for a single edition.
The consequence is a programme that is more responsive and much less stable, which is a deliberate trade.
Removal happens through programme review, and is generally driven by declining relevance, governance failures or the need to make room. Wrestling's proposed removal in 2013 was reversed after an extraordinary campaign and rapid governance reform — the clearest demonstration of what the criteria actually require.
The Winter programme faces tighter constraints, since fewer nations can realistically compete.