If you want to feel fitter for Christmas but are put off by the cold weather then a new Black Friday deal offering the best ever discount on Davina McCall's fitness app might be the perfect way to jump start your health kick. Long gone are the days where working out from home meant step aerobics and old DVDs you've done hundreds of times.The star's 'Own Your Goals Davina' app is a health and fitness platform which helps fans exercise at home online as well as introducing a host of experts on subjects ranging from healthy eating to tackling the menopause.