I think the lead author's name is Steves, in Gerontology. She looked at brain and cognitive function in twins over ten years doing heavy leg exercises and found a statistically very significant difference in women with strong legs in terms of cognitive function and mood.

This makes sense. The legs are the second heart. The only reason that gravity doesn't pool blood in the feet are valves in the veins and leg muscles that pump blood back. It is common sense that strong legs lead to more vitality and reduce depression. We age from the bottom up and it is difficult to find anyone with a spring in their step who is depressed. Maybe we are confusing the chicken and the egg on why depressed people move slow.

If I had to recommend on exercise for mild to moderate depression, knees permitting, it would be squats and lunges.

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