I've created a new copy of the exercise log here. I've opened it allow anyone who has the link can edit anything outside of two columns.
While I may change mine, I've filled out my record as an example. All you will need to do is to enter your CUMULATIVE hours in the cell for the appropriate month. There are formula in place to track things properly and I've protected columns E and K so the formula can't be overwritten. Please let me know if there are any other features added to this spreadsheet.
Personally, for me it helps to see other people's activities. I don't feel so isolated as can happen in the winter, especially since I can't really do group training anymore outside of a twice/month T'ai Chi class.