I have played golf for 46 years. Throughout that time my clubhead speed with the driver hovered around 100 mph. Although I was scratch I was unable to increase my swing speed any significant amount until this year when I came up with my own program with for increasing speed. I started at 101. In thirty days I was averaging 112(same machine) and since am now averaging 116 and often can make swings at 120+. My training methods involve increasing fast twitch muscle fibers and a few fundamentals that appear contrary to most advice about long hitting ( such as swing slow and attempt to "hold the angle"). If you are interested in my program send me your email and I'll be glad to give it to me free. I sell an ebook telling exactly how I did it for 8.95 or 3.95 on kindle by the name of Increase Your Clubhead Speed Now! You can get it through amazon or www.golfspeed.biz or let me know at blopar@comcast.net and I'll send it to you free.