I have to shovel manure year around so you'll get no sympathy from me! But I am prepared to pass on some sage advice proffered by my trainer (and I paraphrase): "If you want to get some training benefit out of (fill in blank here) do so ambidextrously". I am trying to cultivate ambidextrous manure shoveling, but it ain't going so well. I would recommend at least two different sizes of shovel for those light and heavy workout days