Yield and oppose gravity.
When talking about movement, two aspects should be defined:
The first refers to how the different parts of the body are connected or chained to produce a displacement through space.
The second refers to the direction(s) in which the body moves through space.
This can occur either as described in 1 or by using the musculature (lifting a part of the body)
The difference is that the levels of organisation in terms of economy are different.
The concepts I have described have been explored by different colleagues through different approaches to human movement
I am referring to Laban / Bartenieff Movement Analysis (LMA), Body-Mind Centering (BMC), Core Integration, Movement Lesson, among those I know.
Living in a gravitational environment to produce a movement will require two forces of sense and opposite direction.
Newton's third law states that for every force there is an equal and opposite force. For example, if you push on a wall, it will push back on you as hard as you are pushing on it.Therefore for the body or one of its parts to go up it is necessary that another part go down.
When this does not happen the displacement of the body or one or more parts of it through space will be made from muscular work.
If we consider gravity in relationship to the body the motion can be produced by yielding to gravity (going down) for which the muscular action is minimal or none, or opposing gravity (going in any of the other directions in space)
The muscles are not meant to produce movement but to accompany it.
Rotational aspect of movement is inherent to the human race from birth, since the baby is born rotating (natural delivery without inconveniences and at term) (3)
Another aspect necessary for movement to travel through the body and this in space is the transfer of weight.
In the action of walking or jumping in one foot the weight of the person is transferred from the heel to the tarsi, metatarsals and fingers.
This action occurs in conjunction with inversion and eversion of the foot accompanied by supination and pronation of the ankle which produces a rotation that travels from the bottom up or spiral.
The next step is the displacement of the pelvis on the support foot
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(1) In sports and rehabilitation people use terms such as resistance, strength, power, localised muscular resistance, etc., but the movement of the muscular unit is always the same.My point of view is that such an approach has led to develop of methods for the "different" types of strength concluding by looking for the improvement of movement from the muscle work and ignoring the above mentioned aspects.