My daughter was a full IB student and she belonged to a club team that practiced 7 days a week, 2-3 hours a day. It was difficult but can be done. IB is demanding with the amount of work that you need to do. She definitely learned time management. She went to a top LAC and participated in a Div 3 sport. The first year was fine, by the second year she felt she needed to concentrate on school which was always her priority. She also had a part time job. She dropped her sport. The LAC was definitely more challenging than HS IB if she wanted to maintain a high GPA which was important to her.