From LSWiki

Class: Athletic Skills
Attribute: Strength
Pedagogy: Physical Training
Practitioner Term: Performer of Massive Exertions

The ability to perform feats of strength such as maintaining an effort level over 100%, bending bars, breaking down doors, and
lifting heavy objects.  Partially this is a matter of training one's body for the all-out exertion required for these tasks, and
partially it is about techniques of leverage and traction that put one's strength to its best use.

Trainers

Gurbodax: Akurch
Obsidia: Goth
The Aumbrie: Rindol Meadowdark
Association required:
Questors of Tyr: Cerradin
Guild required:
Battleragers: Borulien
Brute Squad: Fezzik
Hawkmen: Katar
Knights of the Round Table: Sir Lancelot
Nizari: Hasan Wanders
Quest required