This study will aim to recruit 60 desk-based office employees via email invitation. Volunteers will be screened using inclusion/exclusion criteria and asked to provide signed consent. Sitting will be de-emphasised in the participant information sheet, and other documentation used at recruitment, in order to minimise any impact on baseline activity measurements. Cluster randomisation will be used to split participants into two equal groups (Group 1 n=30, group 2 n=30) based on their physical location within the office(s) in order to minimise contamination between groups. Randomisation software will be used to allocate groups on www.randomisation.com. Baseline measurement for all participants will consist of completion of questionnaires and activity monitoring as follows: