Hold one of the heavy dumbbells at chest height with both hands, elbows bent and drawn in tight to your sides and chest up the entire time. (mindbodygreen.com)
With barbell on rack at chest height, position the bar so that it's on the front of your shoulders. (muscleandbrawn.com)
At some sites, some trees indeed will express a locally absent ring at chest height where samples are taken. (realclimate.org)