You can edit one of your client's workouts after they have logged it using the "edit workout" link on their Journal here is how to edit a client's workout.
Step-by-Step instructions are below:
Step 1: Click the Journal icon for the client you want to update workouts for.
From your Clients tab, click the Journal icon:
Step 2: Find the day of the workout you want to edit.
Use the links or buttons on the Journal to open the correct date.
Step 3: Click the "edit workout" link.
Once you've got the right date, scroll down to the details of the workout. Directly below the workout title, look for "edit workout."
Step 4: Edit the workout and save changes.
Click on the "edit workout" link, and you will automatically be taken to the workout editor. Make sure to save your changes once you're done!