Physical activity is important in maintaining and improving overall health for all. Students with disabilities tend to have lower fitness levels due to the lack of participation in physical activities, therefore, progressions and modifications to physical activities are needed. Assessing the physical activity levels of students with disabilities provides information regarding their unique needs that aids in determining developmentally appropriate yearly goals and objectives. Physical education provides an opportunity for students to experience a variety of physical activities. Therefore, it is important for physical educators to provide developmentally appropriate activities and assessments that meet the unique needs of all students to promote and assess life-long physical activity. In this article, the authors describe modifications to physical activity assessments for individuals with disabilities. They also discuss techniques used to assess physical activity, namely, heart rate monitors, pedometers, and self-reporting assessments. (Contains 3 tables.)