A Study of the Effects of Tai Chi and Brisk Walking in Balance Ability and Dual-task Walking of the Elderly: A Randomized Controlled Trial

INTERVENTION: Tai Chi Group:Participate in a 16‐week group training program of Tai Chi, with 2 sessions per week, each lasting 40‐50 minutes. The exercise intensity should be controlled at 50% ‐ 70% of the maximum heart rate.;Brisk Walking Group:Participate in a 16‐week, twice‐weekly group fast walking training program, each session lasting 40‐50 minutes, with the exercise intensity controlled at 50%‐70% of the maximum heart rate.;Control group:16 weeks of health education were conducted without any exercise intervention.; CONDITION: falls PRIMARY OUTCOME: Balance ability;Walking ability;Dual‐task walking ability; INCLUSION CRITERIA: 1. Age over 65 years old 2. Able to participate in physical activities and complete the functional tests 3. Attendance rate during the intervention period is not less than 80% 4. Cooperate in filling out the questionnaire, conducting the physical fitness assessment and signing the informed consent