Muscle training device comprising: - a support structure , consisting of: - static elements, attachable to an external fixed structure, and - dynamic elements, - at least one puller that can be moved and operated by a user; - a resistant element linked to the support structure , which exerts a resistance to at least one puller for the performance of a muscular exercise; - fixed pulleys linked to the support structure ; - a hoist linked to the support structure and the resistant element ; and - a closed cable , without free ends and not anchored to the support structure , linked to the resistant element and to the supporting structure through the fixed pulleys and the hoist and operable by means of at least one puller , such as to allow at least two degrees of freedom of displacement and/or rotation in the puller ; the device being characterised in that : - the static elements comprise two vertical central pillars , and two lateral pillars , parallel to the central pillars ; and - the dynamic elements comprise: - at least one drive arm simultaneously movable along one central pillar and one lateral pillar ; - at least one carriage movable along each arm , to which at least one puller is attached; and - a slide linked to the at least one drive arm and the corresponding lateral pillar , so that the at least one drive arm can slide along the corresponding central pillar and the corresponding lateral pillar . - a support structure , consisting of: - static elements, attachable to an external fixed structure, and - dynamic elements, - static elements, attachable to an external fixed structure, and - dynamic elements, - at least one puller that can be moved and operated by a user; - a resistant element linked to the support structure , which exerts a resistance to at least one puller for the performance of a muscular exercise; - fixed pulleys linked to the support structure ; - a hoist linked to the support structure and the resistant element ; and - a closed cable , without free ends and not anchored to the support structure , linked to the resistant element and to the supporting structure through the fixed pulleys and the hoist and operable by means of at least one puller , such as to allow at least two degrees of freedom of displacement and/or rotation in the puller ; - the static elements comprise two vertical central pillars , and two lateral pillars , parallel to the central pillars ; and - the dynamic elements comprise: - at least one drive arm simultaneously movable along one central pillar and one lateral pillar ; - at least one carriage movable along each arm , to which at least one puller is attached; and - a slide linked to the at least one drive arm and the corresponding lateral pillar , so that the at least one drive arm can slide along the corresponding central pillar and the corresponding lateral pillar . - at least one drive arm simultaneously movable along one central pillar and one lateral pillar ; - at least one carriage movable along each arm , to which at least one puller is attached; and - a slide linked to the at least one drive arm and the corresponding lateral pillar , so that the at least one drive arm can slide along the corresponding central pillar and the corresponding lateral pillar . <EOS>