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; a resistance mechanism; and a manually graspable mechanism; 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 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; wherein the input arm assembly comprises: a first arm rotatably pivotable around a first 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 a second arm interconnected to the resistance mechanism and the manually graspable mechanism; wherein the second arm is rotatably pivotable around a second linear axis starting from a start exercise position through a generally forward to rearward or downward to upward path of travel; wherein the second arm is rotatably pivotable around a third linear axis along a generally lateral or side-to-side path of travel on application of upwardly or rearwardly directed force by the user on the manually graspable mechanism; and wherein the second arm is interconnected to the resistance mechanism at a point of interconnection on a distal end of the second arm. a frame; a seat having a seating surface; a pad having an engaging surface; an input arm assembly; a resistance mechanism; and a manually graspable mechanism; 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 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; wherein the input arm assembly comprises: a first arm rotatably pivotable around a first 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 a second arm interconnected to the resistance mechanism and the manually graspable mechanism; a first arm rotatably pivotable around a first 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 a second arm interconnected to the resistance mechanism and the manually graspable mechanism; wherein the second arm is rotatably pivotable around a second linear axis starting from a start exercise position through a generally forward to rearward or downward to upward path of travel; wherein the second arm is rotatably pivotable around a third linear axis along a generally lateral or side-to-side path of travel on application of upwardly or rearwardly directed force by the user on the manually graspable mechanism; and wherein the second arm is interconnected to the resistance mechanism at a point of interconnection on a distal end of the second arm.