It is definitely helpful to keep them moving! I am very much a proponent of moving while learning. As someone mentioned already, play is a good way for students to learn and move at the same time. Also, I think having specific hand signals for students incorporated throughout the lesson is a good way to keep them focused on what the teacher is saying (ex. certain motions for words, as in using their arm to "draw" a circle in the air if you are teaching about earth cycles). Incorporating bits of music is one way I personally learn well, and I think it both catches students' attention and helps them remember what is being taught better.