I use the Trail Runner belt as a disability adaptation to help keep me and my dog safe (sometimes my walking stability isn't great). She can no longer pull me (a constant training issue with her), and I can operate hands-free knowing she'll be safe while I pick up dog poop or go rooting around in the treat pouch.
I use this with a Ruffwear harness. I really thought front hooks were the only way to stop her from pulling, but actually, with a running leash and this belt, I've found I can handle her little Hulk moments even when we're using the back attachment.