Thank you Robert. That was the clip that I saw too. I got the gist of what he said, but doing anything like that makes me nervous.
The problem is, one site is quite large, the other site much smaller, but was hit even harder by Google and has lost 90% of traffic. It has hardly any back links. I don't actively engage in link building, if people link, they link. I'm just trying to give the smaller site a boost. I actually have put the link in the footer.
I have two other sites, but they are completely unrelated to the "jogging & bike riding" sites, and I haven't linked them at all.