Ｔｈｅ first golf

I'm looking forward to playing golf tomorrow, because it's for the first time to play it for me in 20 days. One thing I'm worried about is my back ache. I've been aching lumbago for 7 days, so I've never practiced hitting golf balls yet this year.
I think it's good to play it healthful, and I'll try not to mind my golf score.