TheraPutty in use performing the Key Pinch exercise CanDo TheraPutty hand putty is the standard in resistive hand exercise material. Squeeze, pinch, stretch or twist CanDo TheraPutty using a variety of different finger, hand and wrist resistive exercises. With use TheraPutty will strengthen hand muscles, improve fine motor skills, and decrease stress. Each colour-coded putty has a different firmness ranging from xx-soft to x-firm. With the finger scissor exercise one can place a piece of putty between two fingers and squeeze together. Make a hook with your fingers as you press into the putty to perform the Finger Hook exercise. Loop the putty at the end of your thumb while it is bent. Then pull your thumb upward to extend.