Its your bodies natural way to balance yourself. same as a cats tail.
Biceps flex the arm at the elbow, and triceps (along with the brachialis) extend it. The deltoids raise the arms.
No
Place the stick near to or touching the ball, then extend the arms and stick so that the ball travels smoothly along the ground in the direction you want it to.
The exercise can help build muscles in your arms, but it does not make them longer.
The arm is made to extend and to help you grab an object.
The arm is made to extend and to help you grab an object.
You keep your arms straight without bending any elbows and swing them, pushing yourself along with the poles. Almost like skiing on land.
It doesn't mean anything if you don't sway your arms while walking; it is personal choice. If you feel awkward or weird in public, you can try swaying your arms, but likely no one notices.
What is in a key
It all depends on how long someone's arms and legs are.
Yes, the doral musculature of the body acts to extend joints. For instance, the triceps extends the arms, and the paraspinal muscles extend the spine.
flexing is tightening of your muscles, and joints bend to let you extend your arm from the elbow and shoulder