How do I change a user's Personal Trainer settings?

As a group administrator you can adjust the Personal Trainer settings for your users to change the difficulty of their training. From the Settings tab in your admin portal you can use the drop down menus under Depth and Threshold.

Threshold is the number of stars that must be earned in a level for the Personal Trainer to advance a user to next level in that exercise in their next training session. Depth is how many levels in an exercise must meet that threshold before the exercise is taken out of the active rotation in the Personal Trainer and replaced with a different exercise.

For more information about Depth and Threshold, see this article. Depth is referred to here as "Training Strategy" and Threshold refers to "Difficulty".