body weary, strength exhausted (idiom); extremely tired; spent

muscles and bones; physique; strength; courage

tumble; somersault

lit. muscles and joints; by ext. the relations between parts in a speech, composition etc

tendons and muscles

cramp; charley horse; to pull a tendon

brains; mind; head; way of thinking

to be a real headache; to find sth a real headache; to beat one's brains

steel reinforcing bar

to use one's brains; to think