Tail
All of them used in conjunction. In the same way both of your legs and the rest of your body are used to help you change direction.
well to awnser your question your stomach has alot to do with your upright posture and some of your spinel erectors play a role in this as well i hope this helps you...
an upright posture
Upright Posture
Roots
have the hoover upright and undo the 2 scews one on each side at the back then lift top panel also slider will pop of hope this helps
A first degree lever, with the fulcrum between the force and the load, will change the direction of the force. Think of an adult on the ground pushing down on a see-saw to lift a child on the other end up into the air.
A great white dorsal fin does always stay upright in the water. The fin is what helps the shark swim.
To see an upright image of yourself in a concave mirror you must be closer than the principal focus. Hope this helps.
Well, If you haven't noticed Aangs Whirlwinds can change the direction of Zukos Firewall. Hope That Hint Helps.
Roots
a machine helps us do work because it can a)multiply force, b)multiply distance, or c)change the direction of force.