A finger exercising device for the training, warming up, and/or rehabilitation of muscles, tendons, and pulleys of a phalanx, comprising: a base , which defines the longitudinal direction (DL), transverse direction (DT), and sagittal direction (DS) orthogonal to one another and a front face (A) perpendicular to the sagittal direction (DS), and wherein the base includes at least one longitudinal guide extending in the longitudinal direction (DL); a carpal support , associated with the base , to support the base of the palm of the hand where the carpal bones are located; at least one distal phalangeal support , associated with the base , defining concave distal phalangeal seating to support the ends of the fingers where the distal phalanges are located; the distal phalangeal support being guided by the at least one longitudinal guide allowing a relative sliding between the carpal support and the distal phalangeal support in the longitudinal direction (DL) along a travel distance between maximum and minimum extension positions; at least one elastic element configured to offer elastic resistance to the sliding, in the longitudinal direction (DL), of the at least one distal phalangeal support ; characterized in that the carpal support defines a concave carpal seating defined by a concavity formed between a sagittal carpal surface , mostly facing the sagittal direction (DS), and a longitudinal carpal surface , mostly facing the longitudinal direction (DL), the longitudinal carpal surface being closer to the distal phalangeal support than the sagittal carpal surface and being adjacent to the sagittal carpal surface , forcing an arched, semi-arched, or extended grip of a hand between the concave carpal seating and the concave distal phalangeal seating . a base , which defines the longitudinal direction (DL), transverse direction (DT), and sagittal direction (DS) orthogonal to one another and a front face (A) perpendicular to the sagittal direction (DS), and wherein the base includes at least one longitudinal guide extending in the longitudinal direction (DL); a carpal support , associated with the base , to support the base of the palm of the hand where the carpal bones are located; at least one distal phalangeal support , associated with the base , defining concave distal phalangeal seating to support the ends of the fingers where the distal phalanges are located; the distal phalangeal support being guided by the at least one longitudinal guide allowing a relative sliding between the carpal support and the distal phalangeal support in the longitudinal direction (DL) along a travel distance between maximum and minimum extension positions; at least one elastic element configured to offer elastic resistance to the sliding, in the longitudinal direction (DL), of the at least one distal phalangeal support ; characterized in that the carpal support defines a concave carpal seating defined by a concavity formed between a sagittal carpal surface , mostly facing the sagittal direction (DS), and a longitudinal carpal surface , mostly facing the longitudinal direction (DL), the longitudinal carpal surface being closer to the distal phalangeal support than the sagittal carpal surface and being adjacent to the sagittal carpal surface , forcing an arched, semi-arched, or extended grip of a hand between the concave carpal seating and the concave distal phalangeal seating . <EOS>