Torque delivered by a hand ratchet with 1/2" socket
Okay my curiosity was piqued. I am an average 60 something year old guy who turns a wrench for a living.   I clamped my old school Beam Type Torque Wrench in a vise. Using a 1/2" square x 3/8 drive drive socket on the torque wrench and an 8" ratchet I hit 70 ft-lbs. This was just a straight steady pull. I did not test to see how long I could hold that number.