The Snook and Ciriello (Liberty Mutual) psychophysical look-up tables, which help define population capabilities for weights and forces during manual taskings involving  lifting, lowering, pushing, pulling, and carrying, are now available on your handheld.  Implementation is as simple as selecting each task parameter from a list to determine the acceptable weight or force!  PocketSnook is a freeware product.  Get PocketSnook HERE.