base of support
center of mass/gravity
compare & contrast the relationship
compare laying on back/front to laying on side.
compare sitting in 90/90 or cross-legged or straddle, to sitting in a chair to sit-bone contact only.
compare both knees to one, low to high positions.
compare standing flat footed to ball of foot to heel. from squatting to standing. from both feet to one.
- low to high (Height)
- both sides to one side (width)
- Weight distribution (depth)
(small to big bos)
movement where the base of support is in motion requires the additional element of actively tracking center of gravity through space, (the 'transition' between establishment).
leverage is active.
structure and movement without leverage is passive,
BOS + COM/COG
to actions of the,
short chain + limbs.
- Downward force to push away
from ground, through -
advancing - Micro <-> macro
In a active hang position.
First layer: creating an Arm.
The base of support is a particular part of the hand that is pulling down. center of gravity extends straight down into the ground from hands and center of mass is suspended between the two.
second Layer: attaching the arm to body.
The base of support for the arm (where it attaches) becomes the shoulder girdle- lessening the distance between the base and center of mass.
third layer: Attaching the shoulder girdle to the short chain.
The base of support for the shoulder girdle is the ribcage, (pelvis must align to support the ribcage as lead). Again, lessening the distance between the base and center as well as the distribution of weight.
(to be technical- the first BOS will always be the 'arch' in the hand or foot)
again, 'the layering' is about manipulating the relationship between bOS and COM/COG through- Height, width and depth, to be as close together as possible, whether by change in angle and/or distribution of weight.
With a predictable short chain- limbs become (sensory) antennae, to provide appropriate support when needed.
In a task, they can utilize leverage of the entire system.
Contextual task example:
standing on two feet with weight evenly distributed. switching over to one side requires more force going down that leg from the center of mass.
To switch back to the other side- feel weight travel across the center of mass down to the other side and landing in the foot. move back and forth focusing on the internal weight shift happening- up/down one leg, across the center of mass and up/down the other leg, without feet ever leaving the ground.
Next - same sensations but with feet leaving the ground, stepping in any way.
Next - focus only on the feet and center of mass and continue walking around making the legs between these points 'disappear'.