Following a physical training regime and maintaining a healthy body is of importance to any human being. However, for a patriarch there are additional requirements of sexual virility and the capability to inflict violence (crucial ability even if this ability is never applied). Both of these abilities are inherently connected to your physical fitness. Furthermore, weight lifting training increases your testosterone levels, which will naturally lead into developing the patriarchal virtues and a healthy masculinity.
For these reasons, any patriarch should keep a disciplined regime of physical training which include both aerobic exercises and weight lifting.