1. Go to the gym
2. Get on the bench press
3. Put on 100 lbs
4. Press it up normally and hold it in the air
5. Now, allow your left arm to decrease the amount of weight it is holding.
You will notice that your right arm is working harder to keep the weight up.
That is because it is bearing more of the weight than before.
Your left arm is the axle with busted airbag.
Your right arm is the 5th axle bearing all of the weight.