58. Joined together!

In English Language these are a pair or grouping of words that is used together as an idiomatic expression, usually conjoined by the words and or or. Expressions like `to and fro', `safe and sound', `take it or leave it', and `rhyme or reason' are some of the examples of the grouping. The two words in these expressions are inseparable; their order is fixed and they have only one meaning. What are such pairs called?

57. Surf up!

This is a common move in surfing. Just name it.

56. Poisoning to live...

It is the practice of protecting oneself against a poison by gradually self-administering non-lethal amounts. The practice derives from __________, the King of Pontus, who so feared being poisoned that he regularly ingested small doses, aiming to develop immunity. Having been defeated by Pompey, legend has it that he tried to commit suicide using poison but failed because of his immunity and so had to resort to having a mercenary run him through with his sword. The practice finds mention as a plot device in many literary works, the famous being The Count of Monte Cristo by Alexander Dumas. Which practice?

55. Army training...

It is a combination of the words meaning "scratched line". It was originated in Britain during the early Roman Empire and was initially designed as a training regimen for Roman foot soldiers who ran the course in full armor and field packs, as it was thought this would improve their footwork. What?