Squash Options

In the Animation and Rigging menu set: Deform > (Create) Nonlinear > Squash >

Basic tab

Low Bound: Specifies the lower extent of squashing (or stretching) along the deformer’s local negative Y axis. Use the slider to select values from negative 10.0000 to 0.0000. Default is -1.0000.
High Bound: Specifies the upper extent of squashing (or stretching) along the deformer’s local positive Y axis. Use the slider to select values from 0.0000 to 10.0000. Default is 1.0000.
Start Smoothness: Specifies the amount of initial smoothing toward the low bound position (along the deformer’s local negative Y axis). Use slider to select values from 0.0000 to 1.0000. Default is 0.0000.
End Smoothness: Specifies the amount of final smoothing towards the high bound position (along the deformer’s local positive Y axis). Use the slider to select values from 0.0000 to 1.0000. Default is 0.0000.
Max Expand Position: Specifies the center of maximum expansion between the high bound position and the low bound position. Values can be between 0.01000 (near the low bound position) and 0.9900 (near the high bound position). Use the slider to select values from 0.0100 to 0.9900. Default is 0.5000.
Expand: Specifies the amount of expansion outwards during squashing or inwards during stretching. Use the slider to select values from 0.0000 to 1.7000. Default is 1.0000.
Factor: Specifies the amount of squashing or stretching. Increasing negative values specify squashing along deformer’s local Y axis. Increasing positive values specify stretching along deformer’s local Y axis. Use the slider to select values from -10.0000 to 10.0000. Default is 0.0000 (no squashing or stretching).

Advanced tab

See Advanced deformer options.

Deformation Order: Specifies the placement of the deformer node in the deformable object’s history. For more information about deformer placement, see Deformation order.
Exclusive: Specifies whether the deformer set is in a partition. Sets in a partition can have no overlapping members. If on, the Partition To Use and New Partition Name options become available. Default is off.
Partition To Use: Lists any existing partitions, and a default selection Create New Partition. If you select Create New Partition, you can edit the New Partition Name field to specify the name of a new partition. Only available if Exclusive is on.
New Partition Name: Specifies the name of a new partition that will include the deformer set. The suggested partition name is deformPartition, which will be created if it does not already exist. Typically, you might put all your exclusive deformer sets in the partition named deformPartition. However, you can create as many partitions as you like, and name them whatever you want. Only available if Exclusive is on.