This website provides a lot of great questions for a conversation class. It can be adjusted for all levels and is fantastic with multi-level classrooms, especially if you have a multi-cultural student base. All the students really seem to love talking about sports in their own country and explaining fun parts of their culture to each other and the teacher.
I haven't read the full text of this research, but the abstract is pretty clear: Playing sports in class aides in learning and retention. My students certainly need more activity in their lives and adding in a day where they play the sports we're talking about, speaking only English, improves their focus and motivation for weeks, even if there wasn't research to prove it.
This is a collection of lessons about sports. They include videos, worksheets, and games for many of the lessons. I find these helpful with students that have a very low interest in English, but love sports. Personally, I know very little about sports, but these lessons make it possible for me to teach students topics they're interested in, even if I'm not! Also, InsideOut has a huge archive of valuable resources and it's worth taking a further look into the website.
This is a great article about the benefits of sports based English classes. They also give specific examples of materials they've used and how they fit the Common Core standards specifically. There are a lot of cohesive ideas presented in the article, as well as analysis of why sports based English classes are beneficial for low-level English learners.
A blog for students written by students. I really like that if the students respond to the blog post, the writer will write back. There's a good deal of personal buy-in and there are many blogs on this site, not just this one. I find this useful as a homework assignment or in getting them to start blogs of their own.
This is an entire lesson plan, including video, of famous soccer players talking about learning English. If you have soccer/football fans in your class it might be just what they need to hear some of their heros talk about their struggles with English. It is a British website, but I find for ESL students they're much more interested in "football" than soccer and most of the teams they know are British.