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.
Since crunches or sit ups hurt your neck so much, I would steer clear and focus on other ways to work your abs. There are a ton of pilates moves that work the abs and don't strain the neck.henever i try and do sit ups or crunches i end up like straining my neck to the point where it hurts and i give up and it has no effect on my abs what so ever. Ive tried everything and just cant stop straining my neck, when i try to sit up i lift and strain my neck! Please help how do i stop this its so annoyinggggggg.