Istanbul is a city with a rich sports culture, and there are many sporting events and activities to see and participate in while visiting the city. Some popular sports activities in Istanbul include:

Football (soccer): Istanbul is home to several professional football clubs, and locals are passionate about the sport. You can catch a match at one of the city's football stadiums, such as the Türk Telekom Stadium or the Vodafone Park.

Basketball: Basketball is also popular in Istanbul, and the city is home to several professional teams that compete in the Turkish Basketball Super League.

Horse racing: The Veliefendi Race Course is a popular venue for horse racing in Istanbul, and races are held there throughout the year.

Tennis: Istanbul hosts an ATP Tour tennis tournament each year at the Koza World of Sports Arena.

Swimming: The city has several public and private swimming pools where you can swim laps or just relax by the pool.

Hiking and outdoor activities: Istanbul is surrounded by beautiful forests and mountains, and there are many opportunities for hiking, cycling, and other outdoor activities in the surrounding area.