The ‘editor’s choice’ which is available for free is the meta-analysis of walking. This simple daily task has many benefits and the dose-response relationship is explored by Hamer and Chida. There appears to be about a 30% reduction in both cardiovascular risk and all-cause mortality with a casual walking dose of about 3 hours per week. Walking pace was a stronger independent predictor of overall risk compared with walking volume (48% versus 26% risk reductions, respectively). Next month there are several other papers highlighting the benefits of walking (see Online First) so this simple physical activity may be more powerful than is often appreciated. A case of ‘a kilometer a day keeps the doctor away’?