Lessons

Level 1, Lesson 3, Topic 4: A Little History & Some Engineering

A great deal of what happens with the core is the application of the law of engineering.  If you pick up a short stick and a long stick, holding each at one end, the short stick will be easier to manipulate.  We apply the same principles in a workout:  When doing abdominal crunches, and lifting the shoulders off the floor to challenge the abs, putting our hands behind our heads is an easier exercise than extending the arms over the head while crunching.