If you have a fairly heavy dumbbell you can do "vertical rowing." Stand bent over at the waist, with one hand resting on a chair or something for support. Hold the weight in the other hand and just pull it up, as if you were pulling an oar. This exercise gets the upper back muscles mainly, but it also hits the lats. Surprisingly, regular pushups also work the lats to some extent.

Another good golf exercise that gets the lats and the lower back is this "bridge" exercise: Sit on the floor with your legs straight out in front of you and your palms flat on the floor beside your hips. Then just push your weight forward so that the soles of your feet meet the floor, keeping your arms straight, and the rest of your body goes up and arches. At the end of the move, just your hands and feet are on the floor and your legs are bent at the knee, and the rest of your body is either horizontal or even arched up a bit. Be careful with that one though. Just do a few reps until you get used to it, or you can get a muscle spasm. It definitely works the lats.

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Todd
Philadelphia, PA
USA

The reason the pro tells you to keep your head down is so you can't see him laughing. ~Phyllis Diller