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Hayes, L. D., Sculthorpe, N., Herbert, P., Baker, J. S., Spagna, R., & Grace, F. M. (n.d.). six weeks of conditioning exercise increases total, but not free testosterone in lifelong sedentary aging men. Aging male, 18, 195–200. http://access.bl.uk/ark:/81055/vdc_100089570029.0x000017