Shoulders
To be honest when I first saw Jax in MK 2 I wasn’t impressed by his design. All that changed with his very next appearance in Mortal Kombat 3. The guy had metal arms. METAL ARMS!!! That was a pretty bad ass design choice and with shoulders and arms made out of steel it’s likely that you’d have no problem pushing some heavy weight.
Finishers:
Lateral Raise
Standing Dumbbell Press