Apparatus for performing an arm curl exercise by a user having a trunk having a longitudinal axis, opposing anterior and posterior sides and an arm with elbow extending from the trunk, the apparatus comprising: a frame, a seat having a seating surface, a pad having an engaging surface, an input arm assembly interconnected to a resistance mechanism and a manually graspable mechanism, the input arm assembly being pivotably mounted on the frame for back and forth travel along a generally upward to downward and forward to rearward direction, the input arm assembly being adapted to reside in a start motionless position relative to a selected arrangement of the seat and pad, the seat and pad being arranged relative to the input arm assembly to position the user in a user start position that enables the user to manually engage the manually graspable mechanism when the user is seated in an orientation where a posterior surface of the user's elbow is engaged with the engaging surface of the pad and the anterior side of the user's trunk faces in a generally forward direction, the input arm assembly comprising a first arm being rotatably pivotable around a first linear axis starting from a start exercise position through a generally forward to rearward or downward to upward path of travel, characterized in that: the input arm assembly comprises a second arm interconnected to the resistance mechanism at a point of interconnection on a distal end of the second arm rotatably pivotable around a second linear axis along a generally forward to rearward or downward to upward path of travel under resistance exerted by the resistance mechanism on application of upwardly or rearwardly directed force by the user on the manually graspable mechanism, and wherein the input arm assembly is adapted such that in the start motionless position the manually graspable mechanism is disposed in a start exercise position vertically below and forwardly of a point of engagement of the user's elbow with the engaging surface when the user is seated on the seating surface in an orientation where the anterior surface of the user's trunk is facing generally forwardly. a frame, a seat having a seating surface, a pad having an engaging surface, an input arm assembly interconnected to a resistance mechanism and a manually graspable mechanism, the input arm assembly being pivotably mounted on the frame for back and forth travel along a generally upward to downward and forward to rearward direction, the input arm assembly being adapted to reside in a start motionless position relative to a selected arrangement of the seat and pad, the seat and pad being arranged relative to the input arm assembly to position the user in a user start position that enables the user to manually engage the manually graspable mechanism when the user is seated in an orientation where a posterior surface of the user's elbow is engaged with the engaging surface of the pad and the anterior side of the user's trunk faces in a generally forward direction, the input arm assembly comprising a first arm being rotatably pivotable around a first linear axis starting from a start exercise position through a generally forward to rearward or downward to upward path of travel, characterized in that: the input arm assembly comprises a second arm interconnected to the resistance mechanism at a point of interconnection on a distal end of the second arm rotatably pivotable around a second linear axis along a generally forward to rearward or downward to upward path of travel under resistance exerted by the resistance mechanism on application of upwardly or rearwardly directed force by the user on the manually graspable mechanism, and wherein the input arm assembly is adapted such that in the start motionless position the manually graspable mechanism is disposed in a start exercise position vertically below and forwardly of a point of engagement of the user's elbow with the engaging surface when the user is seated on the seating surface in an orientation where the anterior surface of the user's trunk is facing generally forwardly.