Another great book by Roland Carrasco is no longer in print.
Back in the day we referred to it as the flexibility torture book. That was black humour — in fact this is an excellent resource and we added many of his exercises. Though in French, the photographs told the tale.
There were a number of stretches we crossed out with a large X — in particular those showing knee hyper-extension drills.

cover image from – The Souplesse Lover : Gym Training
