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\section{Introduction}   Physical inactivity It is well established that paediatric obesity  is one 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 leading causes UK (2) and internationally (3), there is no evidence  of preventable death, with 2 million deaths per year worldwide (alcohol a decline, and a high proportion of children remain  at 1.9 million per year, 2001)\cite{ers_Ezzati_Jamison_Murray_2006}. Children between the ages 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 require years of age to engage in  at least 60 minutes of moderate-to-vigorous  physical activity per day; however, 41 percent every day (5). Despite this, children on average are insufficiently active (6) and engage in excessive sedentary behaviour. Specifically, only 41%  of boys and only 30 percent 30%  of girls in Wales meet this target\footnote{http://www.bhfactive.org.uk/young-people-key-facts/index.html}. According these recommended guidelines\footnote{http://www.bhfactive.org.uk/young-people-key-facts/index.html}. Moreover, according  to the Department of Health, more than 30 percent 30%  of UK children between the ages of 5 and 12 are obese; Wales is leading with 36 percent 36%  of children in this age group being obese\footnote{http://www.dh.gov.uk/health/2012/04/obesityfacts/}. Childhood obesity leads Many interventions have been conducted  to adult obesity reverse childhood overweight  and obesity, employing a variety of strategies to enhance levels of habitual  physical health issues (e.g. diabetes activity  and cardiovascular diseases) later reduce time spent  in life, sedentary behaviours. Schools have been identified as a key context to implement such physical activity promoting interventions, given that children on average spend 40% of their waking time there (Fox…). Despite this, school-based interventions have been conducted with varied success (Van Sluihs..),  which cost could be attributed to  the NHS different intervention strategies  and the government £5.1 billion per year. variable methodological quality, such as lack of objective measurements of physical activity (7). Furthermore, interventions targeting reduced sedentary behaviour tend to discourage highly valued behaviours, such as engagement with technology.     LINK TO COMPUTER SCIENCE INTERVENTIONS…  Physical activity levels Specifically, ambient displays (also called glanceable displays), which are peripheral, aesthetically pleasing displays of information that support awareness  of children some data can be utilised to make information visible  in Wales were relatively stable between 2007 an appealing  and 2010, with only around half (52-55\%) of children reporting 5+ active days per week\footnote{http://wales.gov.uk/docs/statistics/2012/120828sb762012en.pdf}. This means that current interventions socially interactive manner. They  are not having the necessary impact. designed to be looked at occasionally without distracting us from our activities (Rogers 2010).  Reversing Therefore,  the image aim  of the sedentary lifestyle amongst children, our goal is present pilot study was  to engage with young people utilise ambient displays  in the school environment and help them order  to increase their provide near real-time visual feedback on  physical activity levels. We have chosen the levels during  school environment because (1) this time.     Physical inactivity  is where children spend most one  of their time; the leading causes of preventable death, with 2 million deaths per year worldwide (alcohol at 1.9 million per year, 2001)\cite{ers_Ezzati_Jamison_Murray_2006}. Children between the ages of 5 and 18 require at least 60 minutes of physical activity per day; however, 41 percent of boys  and (2) we want only 30 percent of girls in Wales meet this target\footnote{http://www.bhfactive.org.uk/young-people-key-facts/index.html}. According  to promote active learning, where kids the Department of Health, more than 30 percent of UK children between the ages of 5 and 12  are able obese; Wales is leading with 36 percent of children in this age group being obese\footnote{http://www.dh.gov.uk/health/2012/04/obesityfacts/}. Childhood obesity leads  to use their school playgrounds as outdoor classrooms. adult obesity and physical health issues (e.g. diabetes and cardiovascular diseases) later in life, which cost the NHS and the government £5.1 billion per year.  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.