An exercise grip device for use on a handle of a sport instrument which is to be swung and has a predetermined exterior size and configuration for a predetermined sport of the type swung to strike an object, wherein the handle has a predetermined cross-sectional configuration includes a generally tube-like member with a lengthwise opening and having about hand-width to permit grasping thereabout with one's hand and wherein the tube-like member includes a spring aspect which is preformed to an open relaxed position has an inner surface having a cross-sectional configuration which is larger than the predetermined cross-sectional configuration of the handle and is compressible to a closed position where the inner surface is maintained in contact with the handle to exert a force on one's hand and arm muscles and wherein the surface includes a nonmetal material which in the closed position engages the handle to prevent sliding movement therebetween by virtue of a non metal to handle contact of the grip device with the handle and while engaged by one's hand in a continuous compressed manner prevents sliding movement through the non metal to handle contact and concurrently works one's hand and arm muscles throughout a swing exercise employing the device on the instrument.