The Power SwingFan is one of the easiest and most effective products for increasing distance and control available anywhere because it produces maximum resistance at impact. Pick up this golf swing fan trainer and you'll be on your way to a better swing technique, longer drives & lower scores.The Power SwingFan works using air resistance. The four-finned design produces maximum resistance right as you swing through impact. Unlike weighted clubs - YOU do the work! Because the Power SwingFan golf swing speed resistance trainer stands up by itself, it is much more likely to be used than stuck in a closet. It looks so inviting when you see it that it begs to be swung. Regarding how much, how hard and how often, think of it just like lifting weights. Swing it to exhaustion every couple of days. Since this golf swing power trainer has the benefit of increasing strength, you want to break down your muscles and allow them to rebuild. You can swing very aggressively and a typical workout routine might be to start with 2 sets of 25 reps swinging at about 70% effort. After a week build to 3 sets of 30 reps and you can start firing harder through impact. We also suggest swinging left handed for a set so you don't overbuild one side of your body. The Power SwingFan has two primary sizes men’s and ladies (junior available too) with the ladies fins being a little narrower. The ladies' model is suitable for anyone over 5 feet tall and provides is used by some men who want more speed training than strength training. Men's and women's replacement fins can be purchased in sets of four. Two additional notes that are relevant to your training. Although the primary function of the Fan is to build golf specific muscles, you can swing it on 'non-training' days just to retain the swing sequence (hips, torso, shoulders, arms, hands, club) without fatiguing yourself. While you wouldn't want to swing it 100 times before playing, it would be fine to swing it at 50-60% effort just to get the