Abstract: Exercise machine (10) wherein a frame (20) is provided with at least one upr-ght (21) substantially vertical and prismatically shaped; the upright (21) presenting at least one elongated body (26) able to serve as a guide to a pack (P) of flat bodies (31) able to be actuated longitudinally for the execution of training exercises; the upright (21) being externally delimited by a longitudinal shell (22) shaped prismatically and laterally facing the flat bodies (31); at least one plate (14) engaging the upright (21) in sliding fashion to isolate the flat bodies (31) from the outside in co-operation with the shell (22); coupling organs being provided inside the shell (22) to connect said upright and the elongated body (26) rigidly to each other according to a longitudinal direction.