Auxiliary drive for a training device

An auxiliary drive for a training device, comprising a first force measuring device (1), a control device (2), and a drive unit (3), wherein said control device (2) is configured to determine a target force (FS,max), said first force measuring device (1) is configured to determine an actual force (FS) that is applied to a main traction means (11) and is substantially caused by an acceleration of a movable mass (5) connected to said main traction means (11), and wherein said first force measuring device (1) is further configured to transmit the determined actual force (FS) to said control device (2),

• said control device (2) is further configured to compare the actual force (FS) with the target force (FS,max) and to control said drive unit (3) in such a way that, if the actual force (FS) exceeds the target force (FS,max), an auxiliary force (FZ) having a component opposite to an acceleration of gravity acts on said movable mass (5) through a connection of said drive unit (3) to said movable mass (5).