HUMANS AND BIRDS

walk on two legs.
          The main purpose  of Universal Body Building is  the building  on  the body energy.
         To illustrate my point I want to present the random list of creatures with different levels of mobility:  deer, squirrel, eagle. In this list the eagle possesses the highest level of mobility. Of the three guys  only the eagle walks on two legs.
         This characteristic has made the eagle closer to humans than other livings on the list. What differentiates us with eagle is how we utilize our upper extremities. When we moving, our arms, at the best, play role as active passengers. Probably, from the eagle's point of view, it is the lost opportunity. When the eagle wants to move faster it turns to upper extremity and ...fly.  I call it SELF-LIFTING. Eagles have to lift themselves.
 I suggest two conditions which enable some creature to fly:
       - Optimum development of the upper part of their body,
        - High body efficiency.
 It is very interesting  that the second condition is consequence of the former one. .

On the photo: Pushing up from the position head stand with the 13.2 lb(  6.0 kg.) weight belt.