Trunk function is an important aspect of overall physical function. Measuring trunk function can be challenging, and currently, there is not a widely adopted assessment that is precise, easily administered, and inexpensive. The proposed projects aims to evaluate the Volume of Action Score (VoAS) and Trunk Stability Score (TSS) as assessments of trunk function. 120 individuals (40 with disability, 80 without disability) will be evaluated utilizing each test. Their scores will be correlated to the PROMIS Short Form for Physical Activity, surface electromyography, kinematics, and pressure produced at the foot. The findings of the study will result in an understanding of how trunk function impacts the ability to move and stabilize the trunk. VoAS and TSS of the individuals without disabilities will be used to begin developing norms for these tests.