molecule. 1  Chemistry, Physics. the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound. 2  Chemistry. a quantity of a substance, the weight of which, measured in any chosen unit, is numerically equal to the molecular weight; gram molecule.
When I do crunches my neck starts to tighten up and it makes me have to rest before doing another set of crunches.
This is when you have the urge to indulge in neck cracking. Your joint may feel good for a short time after you crack it, but the reality is that the ligaments in the joint become more loose and increase the mobility of your joint.This puts additional stress on the muscles and you will be feeling the urge to have a go at neck cracking more often.any of us think that neck cracking is not a serious issue as we have seen many of our friends and colleagues do it. Some people who crack their neck told me that this practice was recommended to them by their friends as a technique for reducing the stress felt at the base of the neck.