Actually, if you're doing any kind of link exchange, you know that it's going to be a quid pro quo situation.
You scratch their back and they're going to scratch your back.
It's all about an exchange.
Nobody will give you a high quality backlink out of the kindness of their hearts.
It's just not going to happen.
You have to earn it someway.
With an exchange, the way you earn it is pretty blatant.
You give them a link in return.
Usually, to increase the likelihood of success with your backlink request, you need to engage in A>B>C backlink building.
What does this mean?
Well, your article links to website B, which is owned by the person you're trading links with.
That person, in turn, links to your website A from website C.
Do you see how this works?
The last thing that you want of show Google is a very transparent and blatant link exchange where you link from site A to site B, and site B links right back to site A.
That's going to stick like a sore thumb and you might get penalized.