So, if you’re doing downward stretches, it doesn’t enlarge the tunica?
Downward stretches apply tension to the ligaments more than upward stretches do.
The tunica should get the same amount of tension regardless of the direction it’s pulled.
If someone was certain they had exhausted all potential growth from their ligaments they could “target” just the tunica by stretching only upward.
I don’t exactly see the logic behind ignoring the ligaments, unless you can be sure they can no longer be stretched. Even then, I do not know how one would know if you’ve reached that limit, where any effort to exercise the ligaments becomes futile.