The next thing to look at, what are the goals of the client? Many clients like personal trainers simply to help them work out, no specific goals but general overall fitness. For these clients, percentages are probably unnecessary as you as the trainer can monitor their intensity and effort by watching. If it is an athlete preparing for their sports, intensities will give you a great guideline to go by and allow you to accurately pick a weight for their work sets that will increase their potential for strength.
A second option that is available is the Update Changes option. This function simply allows you to define how often the spreadsheet changes are updated. The most common element users use is the Update Every 15 minutes. What this does is to force a save and filter through the data to all the users. One point to consider is that if you workbook is relatively large and you are working on a slow computer you may want to increase that time to 30 minutes. The last area of concern is the Save Changes function. This defines whose changes will override who‘s. There are two options available which say, Ask me Which Changes Win and The Changes Being Saved Win. Which option you choose really depends on the type of workbook you have created.