CanDo Microwavable TheraPutty Exercise Putty is 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. New formula allows you to warm exercise putty in a microwave. Use warmed putty to perform soothing hand exercises.