As many other professions. photographers tend to suffer of particular health issues, related to the way we use the first and most important piece of our equipment: our bodies.
Manufacturers are making great advances in this sense, but photo equipment can still be really weighty to be carried a whole day, especially when it includes wide aperture telephoto and zoom lenses. This daily muscular effort can cause arm tendonitis, shoulder girdle contracture, lumbar strain, torticollis, and similar affections. I can usually feel even my fingers strained after a whole day of work!
There's also health issues related to excessive use of the view, on which this answer sheds some light.
I simply try to carry the most of my equipment hanging from my belt or in a hip bag, rather than a backpack, avoid letting my camera hang from my neck, try to make a rest and stretch my muscles whenever I can, and keep regular physical exercise, but don't really know mucho about health and anatomy, so just go on my intuition and trainers'/doctors' general recommendations.
Are there more developed practices and/or exercises to help minimising negative effects of photography on our bodies?