I've done a good bit of searching and haven't come up with anything. Does anyone have any methods or equipment to anchor bumpers in shallow water, or in my case a pile of bumpers for swim-by training. I only need to anchor the back pile as the width is suitable, however I would like to be able to shorten the distance my dog needs to swim to the back pile. I have a couple ideas in mind, but I tend to over complicate things and I didn't know if anyone has already worked through the same problem and found a solution. Thanks in advance.