A training device for carrying out a muscle training for a person's muscle. The training device includes a control unit having a signal unit, a main body, and a load measuring device arranged on the main body. The person's muscle contacts the load measuring device in use. The load measuring device has a load sensor which determines a load exerted by the person on the load measuring device at a measuring point which is correlated with a partial region of the muscle at a measuring point position. The control unit outputs a contraction signal to the person via the signal unit so that the person performs a signaled muscle contraction based thereon. A successful performance of the signaled muscle contraction is verifiable by comparing a load profile, which is determined by the load measuring device, with a comparison load profile.