When it comes to Weight Training, proper form is essential.
Proper form is a combination of two distinct fundamental ideas.
The first fundamental idea is keeping your trunk in a neutral and stabilized position. What that means is, as you prepare to do any type of weight bearing exercise you have to make sure that your spine is aligned. That does not necessarily mean that it should be straight but aligned. The spine is the strongest when it is in alignment. Stabilization is when the trunk muscles are working in unison to support the spine.