An apparatus for electrical stimulation of muscle tissue, comprising: an electrode array comprising a plurality of electrodes, for positioning in electrical contact with body tissue that contacts said muscle tissue; the electrode array being connectable to a signal generator for generating an electrical muscle stimulation signal; an electrode selector for selecting from the plurality of electrodes one or more electrodes for providing the electrical stimulation signal of a connected signal generator to said body tissue; a sensor (30; 12) for measuring a signal by sensing a property of said muscle tissue, which property forms a measure for activity of said muscle tissue; and a control unit for controlling the electrode selector and for receiving a signal from the sensor (30; 12), the control unit being adapted for identifying a suitable location for electrical stimulation by: (i) activating said electrodes in accordance with a sequence of activation patterns, each activation pattern defining a subset of the electrodes to be activated, each respective subset consisting of at least one electrode, by controlling the electrode selector to select the at least one electrode of the respective subset and providing an electrical muscle stimulation signal of the signal generator to said body tissue via said at least one electrode, (ii) alternately with said activating of electrodes in accordance with an activation pattern, receiving a response signal associated with the activation pattern from the sensor (30; 12), and (iii) selecting at least one of the plurality of electrodes based on the response signals for electrical stimulation of said muscle tissue, characterized in that the control unit is further adapted for: tracking movement of the suitable location for electrical stimulation due to contraction or relaxation of a muscle or activity of a further muscle by repeating (i), (ii) and (iii). an electrode array comprising a plurality of electrodes, for positioning in electrical contact with body tissue that contacts said muscle tissue; the electrode array being connectable to a signal generator for generating an electrical muscle stimulation signal; an electrode selector for selecting from the plurality of electrodes one or more electrodes for providing the electrical stimulation signal of a connected signal generator to said body tissue; a sensor (30; 12) for measuring a signal by sensing a property of said muscle tissue, which property forms a measure for activity of said muscle tissue; and a control unit for controlling the electrode selector and for receiving a signal from the sensor (30; 12), the control unit being adapted for identifying a suitable location for electrical stimulation by: (i) activating said electrodes in accordance with a sequence of activation patterns, each activation pattern defining a subset of the electrodes to be activated, each respective subset consisting of at least one electrode, by controlling the electrode selector to select the at least one electrode of the respective subset and providing an electrical muscle stimulation signal of the signal generator to said body tissue via said at least one electrode, (ii) alternately with said activating of electrodes in accordance with an activation pattern, receiving a response signal associated with the activation pattern from the sensor (30; 12), and (iii) selecting at least one of the plurality of electrodes based on the response signals for electrical stimulation of said muscle tissue, (i) activating said electrodes in accordance with a sequence of activation patterns, each activation pattern defining a subset of the electrodes to be activated, each respective subset consisting of at least one electrode, by controlling the electrode selector to select the at least one electrode of the respective subset and providing an electrical muscle stimulation signal of the signal generator to said body tissue via said at least one electrode, (ii) alternately with said activating of electrodes in accordance with an activation pattern, receiving a response signal associated with the activation pattern from the sensor (30; 12), and (iii) selecting at least one of the plurality of electrodes based on the response signals for electrical stimulation of said muscle tissue, characterized in that the control unit is further adapted for: tracking movement of the suitable location for electrical stimulation due to contraction or relaxation of a muscle or activity of a further muscle by repeating (i), (ii) and (iii).