Everyone can sing if they have the correct anatomy to do so; however, not everyone sings with heart or from their heart. That is ideal as it 'expands' the heart in a good-feel kinda way! ;)
And did you know that singing is also good for the heart? Singing can strengthen the immune system, reduce heart rate, live longer (!) and well, in fact there are quite a number of benefits on a physical, mental (especially if memorizing music), emotional, and social level.
Rather than repeat all the various benefits, I will draw your attention to two websites: (1) http://www.moresingingplease.com/benefits-of-singing and (2) http://ideas.time.com/2013/08/16/singing-changes-your-brain/. You can choose to google others if you wish just by typing "benefits of singing."
And ahem, start singing, alone at least though preferably in a group. Join a choir! What are you waiting for? (Men especially are often lacking in numbers in many choral groups.)
In my blog post about Mother's Day, May 26, 2013 (http://xpressyouressence.blogspot.ca/2013/05/httpyoutu.html), I featured a video of me singing a duet, my first (thus somewhat nervous ...)
Do you enjoy singing and what do you enjoy most about it?