Performing General Physical Activities Performing physical activities that require moving one's whole body, such as in climbing ladders repeatedly on any given day, lifting, balancing, walking, stooping, where the activities often also require considerable use of the arms and legs, such as in the physical handling of materials and working in confined spaces. Knowledge and prediction of physical principles, laws, and applications including air, water, material dynamics, light, atomic principles, heat, electric theory, earth formations, and meteorological and related natural phenomena.