Back about 10 years ago I wrote a PDF splitter / joiner / re-arranger. The document I needed to mangle was like 300 pages and no online tool would support that

Back about 10 years ago I wrote a PDF splitter / joiner / re-arranger. The document I needed to mangle was like 300 pages and no online tool would support that size without money. As I only needed the one file, and I thought it would be an interesting learning experience ... I have a workout manager. It has 2 parts, one is to plan out what weights to put on each of 4 pair of dumbbell bars. It would take into consideration what I last did, and if the time was over a week ago offer to reduce the load. The second application displays the exercise, with explanation and weights. It will toggle between a pair of exercises for 3 sets. I used chatgpt to configure the DB such that 2 exercises did not use overlapping muscles. It also displays a timer (big letters) so I can hold or move the weight in an appropriate amount of time. I made the application because I was frustrated doing it with spreadsheets. I also hated changing weights mid work out. Now I set the weights and do the routine.