I asked two students to act out the following sentence:
"The quarterback threw the ball."
As they did this, I used an iPad app called SloPro (free) to videotape them in action. We then watched the slow motion replay. As we watched, I pointed out the variety of actions taking place - grasping the ball, cocking his arm back, looking down field, turning his body, aiming, tossing the ball. Instead of one verb - threw - we identified at least six separate actions. Then we rewrote the original sentence into three sentences. We practiced this several times, watching a variety of actions in slow motion with the SloPro app.
If you don't have an iPad, you can find lots of great slow motion videos on the internet. Here are a few that the students loved! Slow Motion Sneeze, Slow Motion Flying Cats, Slow Motion Water Balloon
Finally, students searched their journals for simple sentences that they could expand with more detail, especially focusing on breaking verbs down into multiple actions.