text: Last, some students aren't able to physically do any sport. Most students who can't do sports have a sickness that can't go away. Sicknesses can keep a kid away from doing sports. Asthma is a bad one that can be bad enough to where you can't run at all. Cancer can make someone not able to do sports or really anything physical. These kids who have sicknesses have a tough time already and it will be even harder if schools make you do extracurricular activities.