“This time, decide to lose weight for the last time,” the sign said. I went in to see what it was all about.

Rows of collapsible chairs were laid out in front of a stage. On the stage a selection of dumbbells and barbells. I took a seat.

An elderly lady walked on the stage, welcomed us, and said, “We have a really special treat arranged for you. Hope you’ll enjoy watching!”

Pulleys and thick cables lowered a large concrete block, suspending it just above the woman’s head.

The audience inhaled as one. Then silence. Except the cable creaking.

Straining.