There is evidence that deficits in performance are related to difficulties in controlling violent behaviour; for example, violent offenders have been shown to make more errors of commission on No-Go trials, i.e. making a motor response when signalled to inhibit that response (Munro et al., 2007). Although there is considerable evidence that some types of meditation may confer benefits in cognitive tasks that require response inhibition and sustained attention (for a review, see Chiesa et al., 2011), there is no research addressing how yoga might enhance cognitive-behavioural control in prisoners.