Mostly by overstretching particular joints under load, eg. behind the neck presses and pulldowns & pushing myself on dumbbell presses with weights I could move but barely control, at one point I lost control but did not drop the weights.
The others where loading up machines with weights I could not have moved if it weren't for the fixed movement plane of the machine, that ultimately meant trouble for my lower back (leg press) and grinding in my knees (leg extensions).
The others where loading up machines with weights I could not have moved if it weren't for the fixed movement plane of the machine, that ultimately meant trouble for my lower back (leg press) and grinding in my knees (leg extensions).