You don't have to be a professional football player to need strong calf muscles ... aware of your body alignment. Press up for a slow count of two to four. Then, lower back down for a slow ...

In our leg, if the muscle on the back of our thigh contracts and gets ... This short film is from the BBC series, Biological processes of the human body. You could get a skeleton model and connect ...

Muscles can only contract and relax, so they always work in pairs called antagonistic muscles. Skeletal muscle is joined to bones. Its cells contract to make bones move and joints bend. Skeletal ...