Primarily quadratus lumborum, unilateral contraction of spinalis muscles (you can feel these contract in your lower-mid back on the side to which you're bending against resistance) and, to a lesser extent, oblique muscles.
What spinal curvature will result when you throw your torso into lateral flexion?
Lateral flexion usually refers to the spine, or vertebral column. You can laterally flex your head, neck, or your torso (back). =answer= Lateral direction is away from the midline of the body (an imaginary line from the middle of your node to your belly button). Flexion is the opposite to extension where the angle between anterior surfaces is decreased (as you being then closer together by 'bending') - except for the knee where the opposite is true. Lateral flexion is therefore a combination of there two movements.
The little toe is lateral to the foot. It is distal to the torso. Lateral means to the side.
Lateral, means to the side, so I would think that the arm is on the side of the torso (body).
Your abdomen muscles are included in the lower torso as well as your obliques.
The torsional rigidity comes from the torso. The lateral rigidity would come from the arms and the legs becoming stiff.
Trunk isnt a muscle. It refers to the torso or upper part of the body.
Gingerceps
The obliques function to pull the chest downwards and compress the abdominal wall. It also has some actions in both flexion and rotation of the vertebral column. The obliques contracting on one side can create lateral flexion on that side.
Upper and lower legs and torso are good groups to work.
Chin-ups, just as most exercises use a primary & secondary muscle group. The primary muscle group would be the back (or latissimus dorsi). This is what helps to give that "V" - shape in the torso area. (along with slimming down the torso area, of course) The secondary muscle group would be the biceps. Depending on your grip position, you can focus either more on your "lats", or arms.
Chin-ups, just as most exercises use a primary & secondary muscle group. The primary muscle group would be the back (or latissimus dorsi). This is what helps to give that "V" - shape in the torso area. (along with slimming down the torso area, of course) The secondary muscle group would be the biceps. Depending on your grip position, you can focus either more on your "lats", or arms.