Sometimes you sit there, but there's no movement. Perhaps some gas, but no solids Doctors recommend exercise, hydration and fiber.

I write without ink, I vanish in rain, On black I am white, Yet leave no stain. What am I?

I cover ground but claim no land, And clouds rise only at my command.

Trust me, if you're a driver, I'm a fate worse than snow for your control.

Used to tune string instruments or a song by Steely Dan. If you’re a pharmaceutical formulator, I am a versatile ingredient used in lubricants and laxatives, soluble in water, nontoxic but could cause an allergic reaction in some. I am useful also for a pirate who lost one of his legs.