Study on the Construction of High-Intensity Interval Training Program and Its Impact on Metabolic Health in Normal-Weight Young Population with Unhealthy metabolism from the Perspective of Chronobiology

INTERVENTION: Morning control group:Maintain daily activities;Afternoon control group:Maintain daily activities;Afternoon exercise group:HIIT will be conducted from 17:00 to 19:00 in the afternoon, three times a week, each session lasting 30 to 40 minutes;Morning exercise group:HIIT will be conducted from 07:00 to 09:00 in the morning, three times a week, each time for 30 to 40 minutes; CONDITION: Metabolically unhealthy normal weight (MUNW) refers to a body mass inde Xof 18.5 to 24 kg/m² with two or more of the following standard definitions, including: Hypertension (systolic blood pressure =130mmHg or diastolic blood pressure =85mmHg or history of hypertension treatment); (2) Hypertriglyceridemia (serum triglyceride level =1.7mmol/L or using lipid‐lowering drugs); (3) Low level of high‐de PRIMARY OUTCOME: Triglycerides?Total cholesterol?Low density lipoprotein?High density lipoprotein?FBG(fasting blood‐glucose);blood pressure; SECONDARY OUTCOME: heart rate variability;sleep quality;Subjective perceived fatigue index;Body weight, body fat percentage, visceral fat index, basal metabolic rate, BMI, waist‐to‐hip ratio; INCLUSION CRITERIA: 1.Meeting the criteria for metabolically abnormal non‐obesity: BMI ranges from 18.5 to 24 kg/m²; having no less than 2 abnormal metabolic indicators, including systolic blood pressure >=130 mmHg or diastolic blood pressure >=85 mmHg or confirmed hypertension diagnosis; fasting blood glucose >=5.6 mmol/L or confirmed diabetes diagnosis; triglycerides >=1.7 mmol/L; HDL‐C level <1.03 mmol/L in males and <1.29 mmol/L in females; 2.According to the classification standards of the WHO, young people aged 18 to 44; 3.Be able to understand and cooperate to complete intervention activities; 4.Voluntarily participate in the research and sign the informed consent form.