Can you weld parts to a character and not add weight?

I have armor welded to a character's torso, arms, and legs. The problem is that the armor adds some weight to the character, so they don't jump as high and they bounce off the ground more.

I have tried adding a very small BodyForce on the Y Axis of the character's torso, but that seems to be very unstable.

Is there a way to weld parts to a character and have it not add weight?

The armor is 1 big part solid modeled.

Solution is to add no gravity hence what weight is to each part this is to make each part have bodyforce

script.Parent.BodyForce.force = Vector3.new(0, 196.2, 0) * script.Parent:GetMass()