OLA MADSEN from CaffeinAbuse with a great post on creating Squash and Stretch Controls in Softimage using a simple ball rig with particular attention to how the objects mass is moved. Check out the Squash and Stretch Controls in Softimage Tutorial here.

OLA MADSEN notes: “One of the most fundamental (and important) rules in animation is the use of squash and stretch which is used to give the illusion of weight and volume as an object moves.”