Workout Tracking Sheet - Optimizing Plotting

Hi All,

I am building a spreadsheet to help track my workouts and progress. Overall, I have made a sheet that I really like (see screenshots), but I am having one key issue. I want to track progress for individual exercises overtime, but I cannot seem to find a good way of plotting it in excel. I have attached an example dataset of what I am trying to plot (in the sample workbook and screenshot), as well as a screenshot of what I did previously in Google Sheets.

The main issues I am having are:
1. How to format dates properly. If i select columns that are blank, it does not format the dates correctly. If I only select columns that have data, then I have to change the data every single day, which I refuse to do.
2. I have to manually add each series (or each exercise). I do not want to have to do that everytime I do a new exercise. How can I can I plot this data such that it autogenerates a new series everytime I do a new exercise?

Thanks everyone for the help!