Since Athens 1896, there have been many changes to the sports on the summer Olympic program. There were 28 sports contested at Rio 2016 with the addition of golf and rugby 7s. Four new sports will join the programme at Tokyo 2020 with surfing, skateboarding, sports climbing and karate making their Olympic debuts, while baseball and softball are returning to the programme after a hiatus since Beijing 2008. Aquatics, canoe/kayak, cycling, gymnastics, equestrian, volleyball and wrestling have multiple disciplines. Learn more on each sports page.