If you can't use proper form on every rep, of every set, of every exercise... lower the weight until you can. (acaloriecounter.com)
Some people do half chin ups and then they wonder why they aren't flexible and its because they aren't using proper form is this true? (ashotofadrenaline.net)
Protect your body by using proper form, and you will thank me later. (getrippedathome.org)