Free for some? Setting the context for the 'On the Buses' study

Just over sixty years ago a LSHTM scientist, Jerry Morris, is said to have "invented exercise‟ (Kuper 2009). The evidence he used “to show that exercise can extend your life” (Kuper 2009) came not from gymnasia or playing fields, as one might expect, but from observations made while riding London‟s buses. Out of this surprising setting Morris showed that'unavoidably active' bus conductors had substantially fewer heart-attacks than their 'protypically sedentary' bus driver counterparts (Kuper 2009). This despite these research subjects sharing similar social class backgrounds.