Torso

Trunk soft-tissue and surface-anatomy dimensions: shoulder breadth and slope, chest morphology, abdominal shape and definition, waist definition, back morphology, navel morphology. Captures the per-region detail that body-shape.json's whole-body composite metrics do not. Dimensions draw from sports-medicine, body-contouring, and aesthetic-anatomy literature.

Dimensions

• Shoulder breadth (biacromial)

  photo-observable

  ordinal · biacromial_breadth_qualitative

  Width across the shoulders relative to overall body proportions.

  Aligned with anthropometry references on biacromial breadth as a primary frame-size dimension.

  Valid values (3)

  • narrowNarrow— Shoulders narrow relative to hips.
  • balancedBalanced— Shoulders proportional.
  • wideWide— Pronounced shoulder breadth; characteristic V-shape silhouette in lean subjects.

• Shoulder slope

  photo-observable

  categorical · shoulder_slope_qualitative

  Angle of the shoulders from the base of the neck outward.

  Aligned with descriptors used in tailoring and artistic-anatomy literature.

  Valid values (3)

  • squareSquare (high)— Shoulders nearly horizontal; minimal slope.
  • moderate_slopeModerate slope— Average shoulder slope.
  • slopedSloped— Substantial downward slope from neck base.

• Chest morphology

  partly photo-observable

  categorical · chest_shape_qualitative

  Anterior chest wall shape.

  Aligned with descriptors used in thoracic-surgery and pectus-deformity literature.

  Valid values (5)

  • flatFlat— Anterior chest wall approximately flat in profile.
  • rounded_normalRounded (normal)— Standard anterior chest contour.
  • barrel_chestBarrel-chested— Increased anteroposterior chest diameter.
  • pectus_excavatumPectus excavatum (sunken)— Visible sternal depression.
  • pectus_carinatumPectus carinatum (protruding)— Visible sternal protrusion ('pigeon chest').

• Pectoral definition (male)

  photo-observable

  ordinal · pectoral_definition_qualitative

  Visible pectoral muscle definition in subjects with apparent male physiognomy.

  Aligned with sports-medicine descriptors of pectoral musculature.

  Valid values (5)

  • minimalMinimal— Pectorals not visible as discrete landmarks.
  • moderateModerate— Pectorals visible but not prominently defined.
  • definedDefined— Clear pectoral definition; visible separation between pectoralis and surrounding tissue.
  • highly_developedHighly developed— Pronounced pectoral mass and definition.
  • not_applicableNot applicable— Subject not in male physiognomy or chest not visible.

• Abdominal shape

  photo-observable

  categorical · abdominal_shape_qualitative

  Anterior abdominal contour.

  Aligned with body-contouring and abdominoplasty literature.

  Valid values (4)

  • concaveConcave— Abdominal wall sits posterior to the rib cage / pelvis line.
  • flatFlat— Abdominal wall in plane with rib cage / pelvis.
  • convex_mildConvex (mild)— Subtle anterior protrusion.
  • convex_pronouncedConvex (pronounced)— Clearly protruding abdomen.

• Abdominal definition (musculature)

  photo-observable

  ordinal · abdominal_definition_qualitative

  Visible rectus abdominis musculature ('six-pack' visibility).

  Aligned with sports-medicine and bodybuilding descriptors of rectus abdominis visibility.

  Valid values (6)

  • noneNone— No visible muscular definition.
  • subtleSubtle— Minor definition visible at the upper abdomen only.
  • two_packTwo-pack visible— Upper rectus abdominis visible; lower abdomen smooth.
  • four_packFour-pack visible
  • six_packSix-pack visible
  • eight_packEight-pack / pronounced— Full rectus abdominis visible plus inscriptional definition between segments.

• Waist definition

  photo-observable

  ordinal · waist_definition_qualitative

  Visible waist taper between the rib cage and the pelvis.

  Aligned with body-contouring literature on the waist as a perceptual axis.

  Valid values (4)

  • absentAbsent— No visible waist; rib cage to pelvis nearly straight.
  • subtleSubtle— Slight inward curve at waist.
  • definedDefined— Clear waist taper.
  • pronouncedPronounced— Strong hourglass-equivalent waist definition.

• Back morphology

  photo-observable

  categorical · back_shape_qualitative

  Posterior trunk silhouette.

  Aligned with sports-medicine and aesthetic-anatomy descriptors of dorsal-trunk silhouette.

  Valid values (3)

  • v_shapeV-shape— Wide upper back tapering to narrow waist.
  • balanced_rectangularBalanced / rectangular— Approximately equal upper-back and waist breadth.
  • inverted_pearInverted pear— Wider at hip/waist than upper back.

• Lumbar curvature visible

  partly photo-observable

  categorical · lumbar_curvature_qualitative

  Lumbar lordosis visibility.

  Aligned with descriptors used in posture-assessment literature; subset of the body-shape posture dimension at higher granularity.

  Valid values (3)

  • flatFlat— Reduced lumbar curve; flattened lower back.
  • moderateModerate— Standard lumbar lordosis.
  • pronounced_lordoticPronounced (lordotic)— Substantial lumbar curve; sometimes called sway-back.

• Navel (umbilicus) morphology

  photo-observable

  categorical · navel_shape_qualitative

  Shape and orientation of the navel.

  Aligned with descriptors used in abdominoplasty and umbilicoplasty literature on umbilical aesthetics.

  Valid values (6)

  • vertical_ovalVertical oval ('innie' vertical)— Long axis vertical; common aesthetic reference.
  • horizontal_ovalHorizontal oval
  • roundRound
  • T_shapedT-shaped
  • outie_protrudingOutie / protruding— Umbilicus projects outward from abdominal plane.
  • asymmetricAsymmetric

• Linea alba visibility

  partly photo-observable

  ordinal · linea_alba_qualitative

  Visibility of the linea alba — the central midline tendon between the two rectus abdominis muscles.

  Aligned with sports-medicine descriptors of midline-tendon visibility.

  Valid values (4)

  • not_visibleNot visible
  • subtleSubtle— Visible under tension only.
  • definedDefined— Clear vertical midline visible at rest.
  • highly_definedHighly defined— Pronounced midline; common with very low body-fat percentage.