A golf grip-training device includes a main body having attachment means for securement to a golf club by snap-fit in the area of the golf club grip where a golfer's hands are placed. The attachment means is preferably a collar which receives the club shaft. A deformable grip element is affixed to the main body by a living hinge and further includes a gap between the grip element and the main body. A tactile sensory stimulator is affixed to the main body and located within the gap whereby excessive deformation of the grip element causes the stimulator to project beyond the grip element and into contact with at least one of the golfer's hands. The grip element may further includes an aperture through which the stimulator extends when the grip element is excessively deformed.