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.
Report Abuse. 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. One example: lie on your back with your hands tucked under your rear to keep your lower back pressed into the floor.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.