Too late for low stress training?

My gorilla glue auto is in pre flower right at the end of 3 weeks and I didn’t know anything about low stress training before now and I’m wondering if it’s too late to start to try and increase my yield?

My opinion is that she is too young for LST. LST is generally used to increase light penetration and airflow, neither of which the plant needs help with at this point.

Not really a good idea to do LST for the sake of LST. There is a fair chance that you may reduce yield rather than improve it with an auto if it is overdone. Be careful training an auto. They are best left to do their own thing.