I owned this about 25 years ago lost it, but have never found another to favourably compare so bought it again - pity it was not offered on dvd! It is a complete work-out and had given me the lean, flexible body most women strive for! Definitely worth buying again and I have transferred it to a dvd for my own use.
I own several birkenstock sandals and these do not disappoint. Despite the toe post, which I thought would be uncomfortable, they are actually very well designed and spacious,moulding to your feet as no other do!