NCT04532073 - Sub-study of the Essen Study Centre for the ENTAiER Trial

Inclusion Criteria: - At least 65 years. - Chronic disease (musculoskeletal, neurological, internal medicine). - Increased risk of falling (Berg Balance Scale Score 49 or less). - Medical history: feeling of balance disturbance in the past. - Independent living at home or in an old people's or retirement home. - Regular participation in a one-hour event is possible. - Sufficiently mobile to leave the place of residence independently at least twice a week - Written declaration of consent. Exclusion Criteria: - Disease that restricts participation (e.g. terminal disease, heart failure NYHA III-IV, unstable angina pectoris, uncontrolled seizure disorder, decompensated lung disease that already leads to shortness of breath during light activity, advanced cancer, chemo- or radiotherapy ongoing or during the last 3 months, amputation of one or both legs) - Complete dependence on the rollator. - Visual, hearing or speech problems that limit the understanding of the study documents and processes. - Major cognitive impairment (MoCA score 18 or less). - High risk of needing individual supervision during group sessions. - Severe personality disorder or psychiatric illness, alcoholism or other substance dependence affecting the group sessions. - Life expectancy under 1 year. - Permanent bed-riddenness expected in less than one year. - Regular participation in Tai Chi or EYT in the last 6 months. - Participation in intensive sports activities in the last month (e.g. training in the fitness centre or in sports groups which lead to breathlessness and sweating; skiing, mountaineering in high mountains). - Patients who cannot understand the nature, meaning and necessities of participating in a study. - Participation in another clinical trial within 3 months prior to screening for the ENTAiER trial or concurrent participation in another trial that may interfere with this trial.