Here's how: 1  Stand with your feet shoulder-width apart and knees bent slightly. 2  Lean forward, placing your hands just above your knees. 3  Round your back so that your chest is closed and your shoulders are curved forward.  Then arch your back so that your chest opens and your shoulders roll 1  back. Repeat several times.
Typically this count is between 100,000 and 300,000 shutter actuations, with the latter limit associated with the EOS-1D models. In fact, the Camera Shutter Life Expectancy Database is a really neat user-based site for DSLR models of several brands, including Canon.
Sounds fine to me. I don't know of any way to change that count. You may use any Exif Reader to view the shutter actuations on your D70's jpg-files... For example: Mac or Win. I'm around 90.000 actuations on my D70 currently, so there a long way to go for you, if you're lucky :)