I think the most important part of this feature should be simplicity, and making it possible to select exerises, sets and reps very fast and with out lots of clicking.

If I could for example only use my keyboard to move between fields with tab, search for the exercise and then and having a auto complete drop down list to select the correct exercise, then move on to sets and reps with the tab, and like that add all exercises without touching my mouse I'd be super happy :)

I see with other platforms that they add too many fields by default and it becomes too much work to program.

Ditch the youtube search, and rather make that part of the exercise creation dialog.

Example using current design: https://drive.google.com/file/d/1iNMMFPTdA-dspTVKqN3oAk-3LlPhRbC-/view?usp=sharing

Here is a picture of how I program in excel, before moving the workouts to Trainerize
https://drive.google.com/file/d/18Nz2jJtaqKNFZHYSooC_kNMy8R8rxbBn/view?usp=sharing

For me it's all about having an oversight of the total volume per muscles per workout and the weekly volume.
It's first when I move the exercises into Trainerize that I start pairing exercises together and figuring out supersets, etc. At that point I might adjust the sets to make it a bit more userfriendly.

I typically write routines on a per-week basis, between two and six routines per week, depending on client, goals, and training age. Right now it's a bit of a pain to go through each of the weeklies for different groups to ensure that there's sufficient volume per major muscle group across the entire week.

The ability to open multiple routines side-by-side -- ideally up to six, but even two would be an improvement -- would be really helpful, even without the ability to edit them.

Ideally I'd like to see a lot more tools for writing and analyzing workouts (both pre- and post-) by week, month, and/or training cycle rather than simply as discrete routines.

Allows you to order Light, Med, Heavy, days over the training block, replace exercises to work around injury or equipment, see volume and load over certain days, makes you able to set a whole block at once and copy light day to medium and just change reps/sets/weight without having to go back and forth on a page. - Like a table weeks 1-4 at top days 1-6 downside and you fill in the workouts in one go!

Right now, you can only view one workout at a time and it's time consuming to switch between workouts. In order to make sure the training plan as a whole makes sense a feature where every workout scheduled shows in full detail (editable) would be great.