Ability to stand for long periods of time (up to 12 hours at a time), tolerate work in extreme weather conditions, speak and hear worksite safety instructions, withstand prolonged and repeated: lifting, standing, climbing, kneeling, reaching and feeling, crouching, and crawling. Tasks involve the intermittent performance of physically demanding work, typically involving some combination of reaching, bending, stooping, kneeling, or crouching, and that may involve the lifting, carrying, pushing, and/or pulling of moderately heavy objects and materials (20-75 pounds).