Twinstitute
● factual / 8.30pm / BBC2
Doctors chris and Xand van tulleken continue to challenge other identical twins to discover the best ways to keep fit, enhance brain power and beat nausea – yes, really! So first up Pete and Jem, who haven’t been to the gym since their schooldays, and busy mums Fran and Jess, who have five children between them, test which is best: regular moderate exercise or short intense workouts?