Keeping your swing on plane is one of the hardest things about golf. We all fall into bad habits which is why even the best players in the world use these products with their coaches. Take Padraig Harrington who uses the SwingShirt. This keeps everything connected and teaches you the right way to rotate your body. Alistair Hardaway, a top PGA Professional coach in Surrey invented SwingCheck which keeps you on the right plane on takeaway and follow through and is also an alignment tool.