I'm a show known for outrageous personalities and cutthroat competition, but under the surface, I explore surprisingly complex social dynamics. Which reality TV show am I?

1. I've been around for over 40 seasons, showcasing a new cast each time.
2. My challenges often involve physical endurance, strategic thinking, and social manipulation.
3. Tribal councils are a key feature, where alliances are tested and betrayals happen.
4. Jeff Probst is my iconic host.