Strong arms don’t just look good, but they’re good for you as well. We use our upper-body muscles every day, and when these muscles are strong, you can perform tasks more efficiently with less ...

Outward arm action in a jumping jack Rotator cuffs A group of stabilising muscles of the shoulder which helps to prevent dislocation and allows the shoulder to rotate the humerus around its own ...

Your tricep muscles contract and pull, while your bicep muscles relax, causing your arm to straighten back out. You can find antagonistic pairs in your legs too. Just extend and curl and see which ...

ATEN-POUND bite requires a forty-pound contraction of the human jaw muscles. That is because the ... records were made comprises a pair of steel arms, which are normally spread apart by spring ...

THERE ARE HUNDREDS of muscles in the human body. No matter how dedicated ... your back and biceps muscles are involved. Back and arm strength is the main byproduct of pulling movements, and ...

And yet, its humerus (an arm bone) is quite human-like. Characteristics of its ... braincases and relatively large teeth and chewing muscles are similar to those of chimpanzees.