This idea is reflected in a number of different ways in other suggestions (I know this because having recently started using Trainerize I came here to make sure you planned to implement it in the near future) I have in fact voted on a few variations of it before finding this one. It's a major weakness of the platform for coaches/clients who care about the quality of performance of each exercise and who care about implementing effective progressive overload. Truecoach and Everfit do it, as mentioned below, for something so apparently simple it would make such a significant improvement in the platform.

In addition it would be great to see sets stacked so that you can see what happened with each rep in a row as opposed to scrolling down to see each set in a superset. The app Strong does a good job of this and you can easily lock the comment to the exercise and update it as needed.

Truecoach and Everfit both have the ability for each specific exercise to have comments made by the trainer (for extra instructions) and comments made by the client when doing it.

Please!!! I would love to see this

Please do this! It would make it so much easier to communicate with clients and make the workout feel more personalized for them. TrueCoach has this option and I still keep my subscription with them as well for only this reason. Some clients need a little more direction, reminders and cues at the specific exercise. Its also a great place for them to ask questions or comment on the actual exercise.

This would be amazing to be able to coach clients through dropsets or tempo work

I think this would be helpful as I'm charting my notes about the exercise they're currently doing.
My clients also feel the same way, they would like the ability to add notes to the exercise after they're done, instead of scrolling all the way to the top to do it or waiting until after the workout to leave a comment.

Add notes under the exercise. (Eg, if you want them to change the tempo, or to add isoholds for the exercise, or rest pause etc)

I think a lot of trainers want an ability to put comments/notes on each exercise embedded into integral, like a separate column. I know putting it in the target column is a workaround, but it's not intuitive.

Have another text box to enter notes for individual exercises within a workout. Would be a great tool for trainers to take notes.

I want to be able to make notes for individual exercises during the workout, while entering stats

I wish I could add a note to a created exercise in the master exercise library. For example: "squat with slightly narrower stance to support hip injury", etc

Now, it's possible for clients to make notes for the whole workout, but not for each excercise. Would be great to do that (Example: "Reduced weight bench press due to DOMS" --> barbell bench press. "New record, yes!" --> Barbell Squat)

Under each exercise a section to make notes. For more advanced clients there is no way to keep track of things like drop sets.

This would be good for English speakers too. The Train Heroic app allows comments for every exercise and I found it really helpful to be able to give specific pointers per exercise. For example “pay close attention to your knees on this one” or “this one is new for you so use light weight, go slow, and focus on form.”

PLEASE ADD THIS!

Please put a text box after each exercise for client or trainer can write notes !!!

Yessss please!

When a client needs to write “back hurt” or “this was too hard” or even an RPE for each exercise!!

Being able to add a comment onto a specific exercise would be beneficial for the client so they don't have to wait till the end of the session/forget about it. Would be amazing for the trainer so the client see's the instruction as they get to the exercise instead of reading a blog at the start of the workout and forgetting about it.