This guide from the CDC provides tip sheets that show how to make or modify tools to the reduce the risk of back aches and other pain in the shoulders, arms and hands that common to people who engage in farm work and that can reduce productivity. In addition to explaining the practices it recommends, the publication provides both diagrams and photographs that illustrate ergonomic guidelines and practices that can keep people doing work are safe and comfortable, as well as productive.
Download the Ergonomics for Farm Workers publication.