09/06/2026
RAPHA H.I.T. SYSTEM
Body Mechanics Principles
• Tip of the Day
JOHN DAVIS, MASTER TEACHER
MASTERING THE TRIAD: BOS, COM, AND LOG
In the Rapha Holistic Integrative Techniques (H.I.T.) system, we treat the human structure as a mechanical engine
governed directly by the laws of classical physics. To deliver profound, deep-tissue structural pressure without
exhausting your hands, straining your wrists, or compromising your lumbar spine, you must consciously align three
core biometric landmarks on every single stroke.
sequence:
BOS (Base of Support): The geographical area beneath you bounded by the outer perimeter of your feet.
By transitioning into active martial arts stances—such as a rooted front stance (Zenkutsu-dachi) or horse
stance (Kiba-dachi)—you dynamically expand your BOS, creating absolute structural stability.
COM (Center of Mass): Your absolute spatial balance point, anchored deep within your Hara (the
physical center of gravity located in the lower abdomen, approximately two inches below the navel).
LOG (Line of Gravity): The intrinsic, invisible vertical vector running perfectly straight down from your
structural COM straight into the earth.
THE PRINCIPLE IN ACTION: THE STACKED LEAN
To generate effortless, penetrating pressure, you must consciously project your LOG so it shifts toward the leading
edge of your BOS directly facing the client. By shifting your COM forward, you orchestrate a controlled, structural
"fall" into the tissue frame.
Instead of relying on isolated, exhausting upper-body muscular compression, you are harnessing the raw,
unyielding physics of gravity itself. True martial arts body mechanics dictate that the arm does not push; the center
delivers weight through an unbending, skeletal alignment.
Rapha H.I.T. System • Master Teacher John Davis