Doubt it. Arms are used for counterbalancing the legs while running, and without arms you won’t be able to use your legs as vigorously. Otherwise the torque would cause you to turn around.

Hmm… less drag and less mass for sure. But also a loss of balancing. In a medium such as air, I don’t think the losses would ever overcome the advantages

Additional weight makes it harder to accelerate, but once you’re up to a steady speed it doesn’t make much difference.

On the other hand, using your arms as counterweights makes it possible to transfer more force from your foot to the ground with each step.

Doing research for your planned war against the amputees??? I see right through you

one would certainly fall easier

Surprised nobody has mentioned this yet, but the Paralympics may bear you out to some extent. In a lot of events their finish times are similar to normal Olympians, suggesting the reduced weight burden compensates significantly for reduced physical ability.

(It’s not super clear cut, because apples, oranges, and bouncy prosthetics).

Well, considering you always run faster with a knife, obviously not, because then you couldn’t hold one.

It depends on how big your arms are. I bet you can run around with a pistol but not with heavy guns…