Without a warm up not only could you pull a muscle, you will probably play the first few holes badly which will affect your score and confidence for the rest of the round.

Even if you share a small bucket of balls (approx 20 each) with a friend, it will only take about 10 minutes extra of your time. Along with warming up your muscles for the golf swing a warm up should involve;

1. Practicing with the clubs that you think you will be using over the first 3 holes.
2. Analysing your performance on the range so you can plan you strategies for the course, the classic example being if you are slicing the ball to the right on the range you might have to aim left to allow for this when you are on the course. 

So next time you play, head to the course 15 minutes early for a short practice. You’re guaranteed to feel more relaxed and prepared on the first tee and be set up for a better round.