Partial ROM for high-rep arm training
Dr. Mike explains that while full ROM is better for growth, the context of a 1000-rep workout changes the calculus. The goal shifts from maximizing stimulus per rep to surviving the session without hospitalization. He and Scott agree that if forced to do 1000 reps, partials are the only viable option. This isn't a general recommendation but a tactical concession for extreme volume. He also notes that Smaev's enormous arms already limit his ROM on some exercises (e.g., biceps physically block deeper elbow flexion), so his 'partials' are actually his full available range.
Mechanical work = force × distance. Reducing distance reduces total work and associated muscle damage (sarcomere disruption, calcium influx, inflammatory response), lowering the risk of rhabdomyolysis.
But in order to survive 500 reps, you probably don't want to double the range of motion of each rep because that doubles the mechanical work. It doubles roughly the damage that you get.

