Excellent advice!

I jogged and lifted weights for years.

Then I got serious and started a program like this.

Try 500 of these Hindu squats:

http://www.youtube.com/watch?v=jPSVpo4mzNI

Then 100 of these Hindu pushups:

http://www.youtube.com/watch?v=NcW61Bb8uOo

Add in a chinup bar and some 5 Rites:

http://www.youtube.com/watch?v=APzA1W68y1E&feature=relat...

and you're set.

You chiropractor will thank you and your joints will thank you for the next 60 years or so.