Something I see time and time and time again while I'm at my local forge working with beginners. People bending over their anvils to work up close. Putting a strain on that so important lower back muscle group.
One of my very first teachers had a very non traditional approach of avoiding this problem. He stressed that - that low back has to be kept as straight as possible while working, and that if you need to work up close, or the anvil is not your correct height, to bring the work to you. He did this by taking a very wide stance at the anvil, wide but comfortable - and a slight but