The ear hop focal point encourages you to bring the elbow of your recovering arm all the way forward, since you keep leading with your elbow until your recovering hand reaches your ear.

The results of FEA method for cold-bending elbow predicted that the point of maximum stress is transferred from intrados to extrados with the increase of the wall thinning.

There are some questions on the making of heat pushing elbow. The key point is found through research analysis and test.