The answer is yes, and here's why.
How do you flip a science class? Take your direct instruction, put that on a video. All that time you get back, labs, labs, labs. Get your kids involved in hands on learning. In fact, start going down the road of inquiry. Have your students engage in a question and an investigation before you supplement then with some of that video content.
In math class, it's like the biggest no brainer in the flip classroom. Kids struggle with math content, so put the problems and how to do that on the video, so that when they're in class, they get the help that they need. But don't just solve problems, make sure you're also bringing in problems and projects that enhance the learning environment for your students.
Can you flip a class like English that isn't real content heavy? The answer's yes. Think about the mechanics, the mechanics of language, the mechanics of grammar, the mechanics of writing. Those are the type of instructional things you could put on a video, so that you can get your time back in your class to actually get the students involved in the writing process. You could also use those videos as a remediation tool for students who come to your class without the prerequisite skills.
What about a practical subject like art or woodworking? Well, make a video on techniques and tools the students would use so that in class, they can apply those same techniques and tools. So that in class, the students are making things.
Social studies teachers can leverage video to deliver concept overviews. That way, you can get class time back to get students involved in dialog and reading original documents. That way, they're learning more about why things happen in history that just what happened in history.
Can you flip a physical education class? Of course you can, so make a video on how to serve a volleyball, so when the kids come to class, they can serve volleyballs, or how to play a particular game so that when they come to class, they can play the game. This frees up class time for teachers who are bogged down with too much explanation and rule giving.