I had to do some serious heavy shoveling this past weekend. We've got more than four feet of snow out back - it is beginning to melt and water was pooling towards the back door. So I had to shovel a path for the water to escape - that was a lot of shoveling, and I had to lift the snow quite high.
My arm and shoulder muscles were pooped by the end of it, and I figured that they'd be killing me for a couple of days, but they were fine - thanks to doing light weights for several months. But my lower back area, just above and at the top of my pelvic bone was quite sore (don't know the name for the muscles there). Obviously those muscles need more exercise. I do lots of crunches and they seemed to help the area above that, but don't do much for the muscles in question.
What exercises will strengthen that area? They'll have to be something I can do at home.