The human hands are a superior gripping apparatus. Think of the traction you can get without having to generate much clamping force. You can also focus stresses far more precisely with the hands (along with an occasional prop, such as a wooden rod) - and from any possible angle.
I’ve found that I can also SAFELY generate far more stretch tensions manually; albeit, for relatively brief periods of time (compared to hanging). But if I ease into my stretches very slowly, I’ve found that I can generate a terrific stretch with my hands.
Depending on how you nail down the numbers, I have gained a hair over 2” BPEL (or 1.68” if you don’t let me count the regained 3/8” EL that I’d lost over the years prior to beginning PE; however, without PE, I consider that my lost size would’ve been lost forever).
But my EG are far more clear-cut: roughly an average of about 1.3” EG (averaging out my gains of midshaft vs base).
Furthermore, ALL of my gains were via manual PE. And I’ve managed to retain nearly all of my gains, despite not being active in PE since 2006.