Mr. Martin approached me to try his weight lifting calculator. There are hundreds of these programs on the market. I never used a calculator to track my weight lifting. However during the first week I was relieved how easy it was to use and understand. The functions of loading numbers is simple and information is ready immediately for your observation and interaction for your next set. I enjoy the numbers and how they keep me on track.  I cannot lie to myself about my workout routines. I love Last Results and GYMstar Total they inspire me to find new ways to do more weight lifting. I realize why Mr. Martin programmed the software to operate on a smart watch.  I have used one that Mr. Martin loaned me.  I have now ordered a smart watch. Because my numbers are in the range of a professional athlete I ordered a DM98.  Good Luck with your workout.