Antigravity Musculature

The antigravity musculature contains most of the large muscles in the body and is of major importance because our muscles must resist the pull of gravity to maintain an erect posture. Their strength and flexibility largely determine whether proper alignment is maintained in the trunk and hip. The downward pressure of gravity tends to cause the skeleton to buckle at three principal points — the ankle, knee, and hip — and because body weight is largely in front of the spinal column, the body tends to fall forward.

To counteract these tendencies toward buckling, a minimum of five muscles or muscle groups must be activated: the soleus and gastrocnemius at the ankle, the quadriceps femoris at the knee, and the gluteus maximus at the hip. The trunk is held upright by the erector spinae running from the sacrum to the base of the skull; a fifth group, the abdominals, serves as reflex antigravity muscles by maintaining the proper relationship between the rib cage and pelvis in front.

• Five antigravity muscle groups: (1) gastrocnemius & soleus, (2) quadriceps, (3) gluteus maximus, (4) erector spinae, (5) abdominals.
• Gravity tends to buckle the skeleton at three points: ankle, knee, hip.
• Strength + flexibility of these muscles determine proper body alignment and resist the pull of gravity for erect posture.
• Example exercises (per source): abdominals — crunches, hip flexion, sit-ups; erector spinae — back extension, rotary torso, glute-ham developer; gluteus maximus — butt blaster, lunges; quadriceps — squats, leg press, leg extension; gastrocnemius & soleus — standing calf raises.

• gastrocnemius / soleus — ankle antigravity muscles.
• quadriceps — knee antigravity muscle.
• gluteus-maximus — hip antigravity muscle.
• erector-spinae — trunk antigravity muscle.
• abdominals — reflex antigravity muscle.
• atrophic-weakening-muscles — overlapping group prone to age-related atrophy.