Can I use this sign for pulling a muscle?
No, this sign is specifically for the physical action of pulling an object. For a pulled muscle, you would typically point to the area and use a sign indicating pain, strain, or injury.
Does it matter which hand is in front?
Generally, your non-dominant hand is placed slightly ahead of your dominant hand, but it is acceptable either way. The most important part is that both hands move together in a clear pulling motion.
How do I show pulling something very heavy?
You can modify the sign by slowing down the movement, leaning your body back slightly, and using a strained facial expression to visually communicate the heavy weight and effort.