CanDo TheraPutty Exercise Putty is the standard in resistive hand exercise material. TheraPutty is the name trusted by more doctors, therapists, hospitals and clinics than any other to strengthen hand muscles and grip, improve fine motor skills and decrease stress. With each squeeze, pinch, stretch, grip and/or twist, TheraPutty puts you on the path to healthier hands and fingers, improves fine motor skills and decreases stress.