Efficacy of Individualized Aerobic Exercise Training in Patients With Inflammatory Bowel Disease

The goal of this clinical trial is to learn if a 12-week individualized aerobic training program helps manage inactive or mildly active inflammatory bowel disease (IBD) including Crohn's disease (CD) and ulcerative colitis (UC) in adult patients aged 18-65 years. It will also assess participant compliance and the safety of the training program. The main questions it aims to answer are: 1. Does this aerobic training program improve the cardiopulmonary function of participants? 2. Does this aerobic training program help control disease activity? 3. Does this aerobic training program improve participants' quality of life? Researchers will divide participants into two groups. One group will participate in the training program directly. The other group will first undergo a 12-week control intervention (i.e., standard treatment) before proceeding to the training program. Participants will: 1. Take part in the individualized aerobic training program according to their baseline physical activity level for 12 weeks. 2. Visit the clinic once every 4 weeks for check-ups and tests. 3. Keep a diary of symptoms.