Red Hawk, the excercise item from Cabela' s is called the Bow Fit. It costs about $30 with the video tape. I have been using one for about 3 weeks now and it is really helping me to increase my strength and condition. If you just want to strengthen your left arm/shoulder the best thing to do is get a weight and simply hold it out in front of you at shoulder height. Hold it with the palm of your hand facing in and keep your arm completely straight. Start out fairly light and work up in weight. Hold it as long as you can. Do this 2 or 3 times a day and your arm/shoulder will get stronger.