Sometimes when your calcium/magnesium ratio is off, you can get twitching. I get one in my diaphram that feels like a fish flopping in my chest. If you are low in calcium intake, or very low in magnesium, the muscles do a dance of sorts. So you could try to balance that out.
(February 2017) A concrete slab is a common structural element of modern buildings. Horizontal slabs of steel reinforced concrete, typically between 4 and 20 inches (100 and 500 millimeters) thick, are most often used to construct floors and ceilings, while thinner slabs are also used for exterior paving.
slab-on-grade construction Level on ground structure Explanation: Slab-on-grade Slab is the concrete (or other material) platform placed as base for construction. On-grade means right on the ground. So slab-on-ground means that the building has a concrete (or other material) slab or platform placed right on ground soil.