Adding ZSpheres after binding mesh to hold chest mesh in place

The chest area needs more support to hold the mesh.

Let me add some more ZSpheres at the chest area.

Oops! I forgot to unbind mesh. Go under Rigging > Bind mesh.

Remember to unbind mesh after binding to edit the ZSpheres.

Alternate tap on joint to delete the Zsphere added before unbinding mesh.

Click again to add a joint between the chest.

Press X for symmetry. Shift to snap.

W to move.

Move backwards to create a cage like rib.

Press Q. Add more joints until a rib is formed.

Press R to rotate and now, raising the arms shouldn’t affect the body.

Hmm..wrong joint.

The shoulder joint looks more natural.

Lightly tap to select either to rotate the joint or the chain.