if you wanted to flex your arm, and both your biceps and triceps contracted simultaneously, what would happen?

Question

and where is most of the muscle weight found in humans?

Answer 1

If both contracted at the same time, there would be no movement. Since they are antagonistic muscles, one would counteract the other.

I would expect most of the muscle weight to be in the legs.

I hope this helps. Thanks for asking.

Answer 2

You would lock the elbow