Last week, while enjoying a circuit training session at the gym, I pulled my back and had to sit out the final ten minutes. Afterward, the trainer, a newly qualified girl called Chloe, took me into the office and checked me over. As a result of her examination, she suggested I get a massage. Chloe is only 24 years old, so I was a bit reluctant to accept her diagnosis. She called another more experienced personal trainer,...