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Life is about progression. To live is to be in a constant state of movement, of change. The things that drive you, your passions, your goals and dreams need you to keep pushing and striving for them. That's the grind! Dictionary.com defines "grinding" as "working or studying laboriously". It's SO much more than that.
It's getting up everyday, whether your working two jobs while going to school, so you can get your foot in that door; or taking on more responsibility at work due to staff shortage, with little experience but a heart full of faith; or taking that leap of faith and taking your hobby of photography full time and quitting that sure thing of job that you hate. It doing what YOU need to do to get to WHERE you want to be.