Intervention of muscle-building and anti-frailty exercise combined with Baduanjin for frailty of different functional levels: study protocol for a randomized controlled trial

INTERVENTION: Intervention group:muscle‐building and anti‐frailty exercise;control group:health education; CONDITION: Frailty PRIMARY OUTCOME: Short Physical Performance Battery (SPPB);Fried scale score; SECONDARY OUTCOME: body composition;Activities of daily living (ADL);Mini‐Mental State Examination (MMSE);The Geriatric Depression Scale (GDS‐15);Interleukin‐6;Tumor necrosis factor‐alpha;Chemokine ‐9;cystatin C;Vitamin D;Insulin growth factor 1; INCLUSION CRITERIA: (1) Age 70 years or older; (2) Diagnosed as frail or pre‐frail; (3) Voluntary participation in the trial with signed informed consent form.