Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Oh, sorry. Just testing out my musculoskeletal system. Whether your muscles are huge or not, so huge, ...

Muscles are attached to bones by tendons. Muscles contract to move our bones by pulling on them. However, muscles can only pull; they cannot push. This is why they usually work a joint in pairs. One ...