John Mosca:
As older lifters and that is to do other things like walking, swimming, cycling, etc. to keep using more muscles then we do when just lifting. My theory is we get injured because we're using strong muscles in conjunction with muscles we haven't used in years. Make sense?
Don Weideman:
Good thinking John
You see this problem very often with the shoulders. Lifters train the bigger pecs and delts but ignore the rotators and more times than not hit a wall on progress with nagging deep shoulder pain. Even worse they gut it out and end up with tears. I noticed a lot less of this syndrome in Olympic lifters due probably to the dynamics of the training, shrugging for example. Just another reason why teaching the classic quick lifts can benefit all strenght athletes.
By the way John, I try to walk for 45 min. a day and I'm surprised by the improvement in my fitness from this low intensity exercise.