Think posture and alignment
My back isn’t as straight as a textbook swinger like, say, Adam Scott but I’m certainly not slouched at address either. I like to be athletic and comfortable, without being too rigid. Not everyone is built the same so you have to find the posture that works best for you.
I don’t think about anything at set-up – except alignment, an area I need to monitor constantly. If your feet, hips and shoulders are square at address, your swing path is likely to be square, too.