I am an avid golfer. Every chance I get I am out on the course either practicing or playing. I live in Denver, CO, too, where there are many great public courses, and warm weather at various points throughout the year. The winter months provide less playing time even for me, though, so I take advantage of the off-course time by doing cross-training to help my game.
Golf is not one of those sports people often see having cross-training opportunities. However, there are many things you can do in the gym to help your golf game. This is the beginning of a three part series on cross-training for golf. The first phase of a cross-training program involves developing strength and flexibility. For most this build-up phase will last through the end of March. If you are new to physical training you may want to begin by only using body weight movements and exercises. No matter what resistance level you begin at though, you will want to try to increase your intensity (cardio and strength work) every 4-6 weeks.
For a cross-training program I recommend training 3 times per week for approximately an hour each workout. Your goal for a better golf game should be to become a well-rounded athlete. Each workout should include some type of cardio. (I personally like the rower.) Then, you should also include resistance training. Some parts of the body often forgotten by golfers include the wrists and forearms, rotator cuffs, and core and hips. After building strength with resistance training you will want to end each workout by stretching. Important areas to include when stretching are your wrists and forearms, hips, hip flexors, IT bands, glutes, and thoracic spine. By training AND stretching all areas of your body you will become a great all-around athlete and you will be helping to prevent potential season-ending injuries.