The twinstitute

8.30pm BBC two

This new series offers a double whammy of health and fitness facts, as Doctors Chris and Xand van Tulleken – themselves identical twins – put a variety of health theories to the test with the help of 30 other sets of identical twins.

This opener puts the siblings through their paces, as they research the best way to lose that extra Christmas weight, improve their memory and conquer aches and pains without pills.