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\section{Introduction}   It is well established that peadiatric obesity is associated with numerous health implication in later life (1). Despite evidence to suggest that the prevalence of obesity has plateaued in recent years with the UK (2) and internationally (3), there is no evidence of a decline, and a high proportion of children remain at risk of morbidity. Physical ac  It is well established that paediatric obesity is associated with numerous health implications in later life (1). Despite evidence to suggest that the prevalence of obesity has plateaued in recent years within the UK (2) and internationally (3), there is no evidence of a decline, and a high proportion of children remain at risk of morbidity. Physical activity and sedentary behaviour are key variables implicated in childhood obesity due to their influence on energy balance (4). Current physical activity guidelines recommend children between 5 and 18 years of age to engage in at least 60 minutes moderate-to-vigorous physical activity every day (5). Despite this, children on average are insufficiently active (6) and engage in excessive sedentary behaviour. Specifically, only 41% of boys and 30% of girls in Wales meet these recommended guidelines (PREVIOUS REF 1). Moreover, according to the Department of Health, more than 30% of 5 to 12 year old children in the UK are obese, with Wales leading (36%) (PREVIOUS REF 2).  
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This paper presents a pilot study done on using ambient displays to provide near real-time visual feedback on physical activity in a school environment. A class of schoolchildren was monitored with Fitbit activity monitors and their daily physical activity was visualised on a custom ambient display, consisting in part of an LED lighting strip installed in the classroom. Ambient displays (also called glanceable displays) are peripheral, aesthetically pleasing displays of information that support awareness of some data. Part of their appeal is in how they make information visible in an playful and public way, encouraging social interaction and reflection. They are designed to be looked at occasionally without distracting us from our activities \cite{Rogers2010}. In addition to the ambient display, video segments describing mission-based activities were shown on tablet devices to the children at the start of each week.        The study itself ran for four weeks, with a different mission allocated to each week. Each group’s performance was compared to that of the previous day, where the ambient display would indicate if their performance improved.  Pre- and post-intervention measurements were performed, which included anthropometric measurements such as height, weight, and BMI (Body Mass Index), shuttles completed on the bleep test as a measure of fitness, and 7-day objectively assessed physical activity levels.