Jules, our circuit trainer, has a mean streak. He sets up a reasonable circuit and you think you're doing okay and then he introduces 'the extras'. Little sharp bursts in between the regular activities. And one of these tonight involved a jab and cross (boxing for the wisely uninitiated) followed by hands on head, hands together, hands on feet, followed by jab and cross and so on. For a minute.
You would not believe how many combinations of things I could touch in a minute and how few were the designated things.
It didn't help that I was teamed with the exercise monster from hell (aka Ffion) who kept yelling at me. Or that the first extra had involved jab, cross, duck, upper cut, upper cut, duck, jab, cross etc. My brain was tripified (adj. from the Latin, meaning turn to tripe) by the end of that; I didn't really stand a chance afterwards.