Great article on pull-ups, useful for beginners (although it calls them chin-ups). Overhand grip is pull-ups ...underhand is chin-ups (where I come from!) lol. One of the best compound exercises for building muscle, strength and mass. Works back, shoulders, biceps and forearms.
Anatomical paper art, or quilling. Artist Lisa Nilsson says: ‘I find quilling exquisitely satisfying for rendering the densely squished and lovely internal landscape of the human body in cross section.’