I find that these work really well: https://smile.amazon.com/gp/product/B00QXZH0NQ

And then why not to use them: https://www.youtube.com/watch?v=wIas__JthTA

I think the video raises interesting points about the strain induced on tendons and ligaments, but use your brain... You're only looking for a little more weight per hand, and the gloves can be adjusted easily to be less weight.