A multi-digit hand exercise device comprising: a main body with three rings coupled in a triangular formation by a plurality of bridges , wherein each one of the three rings comprises a hole with an inside diameter that is configured to snugly fit a person's finger or thumb and a depth that is approximately half the length of the person's finger, wherein each ring's inside surface comprises a plurality of elevated and flexible irregular shaped inner ridges that run the depth of the ring, wherein each ring's outside surface comprises one or more elevated and flexible and approximately sinusoidal shaped outer ridges around the ring's outside facing perimeter between the two connecting bridges ; a first bridge of the plurality of bridges connecting the first one of the three rings to the third one of the three rings; a second bridge of the plurality of bridges connecting the second one of the three rings to a third one of the three rings; and a third bridge of the plurality of bridges connecting the second one of the three rings to the first one of the three rings, wherein the plurality of bridges and an inside perimeter of each ring between corresponding bridges (502-506, 502-504, 504-506) together define a center hole that is configured to accommodate multiple digits of the person's hand; wherein each one of the first, second and third bridges connecting any two rings comprises an inside surface with a plurality of elevated and flexible inner ridges that are approximately sinusoidal shaped and run the width of the bridge; and wherein each one of the first, second and third bridges connecting any two rings further comprises an outside surface with one or more elevated and flexible ridges that are approximately straight and parallel and run the width of the bridge. a main body with three rings coupled in a triangular formation by a plurality of bridges , wherein each one of the three rings comprises a hole with an inside diameter that is configured to snugly fit a person's finger or thumb and a depth that is approximately half the length of the person's finger, wherein each ring's inside surface comprises a plurality of elevated and flexible irregular shaped inner ridges that run the depth of the ring, wherein each ring's outside surface comprises one or more elevated and flexible and approximately sinusoidal shaped outer ridges around the ring's outside facing perimeter between the two connecting bridges ; a first bridge of the plurality of bridges connecting the first one of the three rings to the third one of the three rings; a second bridge of the plurality of bridges connecting the second one of the three rings to a third one of the three rings; and a third bridge of the plurality of bridges connecting the second one of the three rings to the first one of the three rings, wherein the plurality of bridges and an inside perimeter of each ring between corresponding bridges (502-506, 502-504, 504-506) together define a center hole that is configured to accommodate multiple digits of the person's hand; wherein each one of the first, second and third bridges connecting any two rings comprises an inside surface with a plurality of elevated and flexible inner ridges that are approximately sinusoidal shaped and run the width of the bridge; and wherein each one of the first, second and third bridges connecting any two rings further comprises an outside surface with one or more elevated and flexible ridges that are approximately straight and parallel and run the width of the bridge. <EOS>