Research on the application of dynamic straddle support taijiquan in the aged

INTERVENTION: Experience group:dynamic straddle support taijiquan;Control group 1:sitting taijiquan training;Control group 2:No intervention; CONDITION: Senile debilitation PRIMARY OUTCOME: Balance function evaluation;Grip; SECONDARY OUTCOME: Assessment of daily living ability;Fall effect energy meter (FES‐I); INCLUSION CRITERIA: 1. The elderly over 70 years old, regardless of gender; 2. Conforming to the frailty criteria for the elderly (= 3 Fried frailty assessment methods); 3. Can maintain the balance of sitting position; 4. No mental disorders (those who scored more than 8 points in the simple mental questionnaire assessment) and serious acute and chronic diseases; 5. Clearly expressed their awareness and agreed to accept treatment and follow‐up voluntarily; 6. Sign informed consent