When should i start low stress training ?

As above

I do at 3 weeks

A pic is required to give you an opinion.
Not all 3 week old plants are ready to be lst'd.

It's going to depend on the plant. I start around day 14.

I did its now a week later and I'm getting there first I'd drilled holes in the pots and am using soft plant ties I found using 2 and putting them directly into the coco was good to start as they get taller I can now use the holes

When the main stalk, if bent halfway at 90 degrees, reaches the edge of the pot. Or in the case of topped plants, when the two new main tops reach the edge of the pot.

Pretty glad I didn't top them its my first one and I got a bit scared im growing runtz and can it grow as soon as I tie one down there's another one to do

When they reach the 4th node.