Link exchange is a fun method to earn quality backlinks. I have a Pet niche site that has this metric: PA, DA 30+ and TF around 15. Another one is new with PA-DA 1 but will obviously grow. Both are my money sites and these are not link bait sites to just offer backlink. If you give my new site a do-follow backlink on your pet related website (with may be similar metric to my one), I will give you another do-follow link in return from my high Pa-Da site. In my case, I will provide the article and in your case, you will provide the article No money involved. For mutual benefits.