article_snippet.sent: he and his team recruited 10 pairs of identical twins, who were all men aged 32 to 36 years.
article_snippet.sent: Focusing on twins, who have the same DNA, would allow researchers to see how researchers environment affects researchers bodies.
article_snippet.sent: In each pair of twins, one brother had exercised more over the past three years than the other, though the other reported the other carried out similar levels of exercise earlier in the other lives.
article_snippet.sent: Dr Kujala said: 'On average, the more active members of twin pairs were jogging three hours more per week compared to the more active members of twin pairs inactive co-twins.'
article_snippet.sent: their inactive co-twins had MRI scans of their inactive co-twins brains so researchers could see whether physical activity had any impact on the size of their inactive co-twins brains, and specific regions.
article_snippet.sent: their inactive co-twins did a better job of controlling their inactive co-twins blood sugar, which reduces the risk of diabetes, a finding which is already well-known.