Walking up to a rack of dumbbells and trying to find the ones that you think you use for 10 or 15 repetitions can be one of the most intimidating moments at the gym. It’s easy to feel good and strong for the first couple of repetitions, but not so easy for those 10th or 15th reps. Why is that? The answer can be found in a new TED-Ed lesson.
The Surprising Reason Our Muscles Get Tired is a TED-Ed lesson that explains why lactic acid build-up isn’t the only factor contributing to muscle fatigue. The video explains the roles of sodium, potassium, and calcium in muscle contraction.
TED-Ed lessons include 5-10 multiple choice and short answer questions. But you can also use the videos and write own questions in tools like EDpuzzle. In the following video I demonstrate how to use EDpuzzle.