No, the women above (and the women below) are not being tortured. They are actually practicing a form of mediation called Iyengar that "encourages the use of props to assist with poses."
According to the New York Times, a Jewish couple in Tel Aviv introduced this form of yoga to their fellow orthodox Jews. They say that "their students, taught in single-sex classes, are encouraged to come as they are, even in day clothes or long skirts, if necessary."
You can see an interesting slide show of the different poses here at the New York Times.