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.
Certain supplements and herbs also help relieve neck pain due to anxiety-related muscle cramping.9. Magnesium and calciumâmagnesium deficiency can lead to muscle cramping, aching, and tightness. Take it along with calcium, as both work together for muscle and nerve relaxation.