Work on strength and flexibility during the winter. Pro golfers use the offseason to improve their physical conditioning. That alone won't improve your golf swing, but losing some weight and adding muscle can help you avoid injury and play better overall when the weather improves. Try to get in at least 45 minutes of aerobic exercise four or five days a week. Create your own fitness program designed to keep you active and flexible.

Find an indoor driving range to escape the cold. Practicing shots in a heated facility is an option during winters. You'll be able to hit your driver and fairway woods and irons the full distance indoors, Some facilities are open late into the evening, allowing you to practice your golf swing at night if you work during the day. Find indoor ranges by asking fellow golfers or check with your club pro.

Swing a weighted club in your garage if an indoor driving range isn't an option. Weighted golf clubs are usually shorter than regular clubs, allowing you to swing them easily in your garage. The PGA of America recommends swinging a weighted club a few minutes every day to improve strength in your wrists and arms, and to increase your clubhead speed.

Work on your grip indoors. If necessary have a professional golf instructor show you a proper grip, or buy a club at your local golf store with a training grip attached. Keep the club inside your house during the winter and work on your grip several days a week. While watching TV, grip the club during each commercial and hold it until the commercial is over. Wrap paper around the grip of a regular club. Practice holding the club with a grip so light that the paper doesn't make a crinkling sound.  This teaches you to hold a club without tension in your hands and arms.

Get outside into your backyard on a nice winter day if golf courses or driving ranges are not an option. Swing a golf club 100 times without hitting any balls. Practice each swing as if it were the real thing. Working on your strength and flexibility, your grip and taking 100 practice swings as many days as possible during the winter could be enough for significant improvement in your swing.