Doctors Chris and Xand van Tulleken put competing health theories to the test with the help of 30 other pairs of identical twins.
Get Thin Fast
Season 1 • Episode 1
Sleep Deprivation
Season 1 • Episode 2
HIIT versus Easy
Season 1 • Episode 3
Better Brain
Season 1 • Episode 4
Giving Up Smoking
Season 1 • Episode 5
Learn a Language
Season 1 • Episode 6
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