Exercise bad for silicone prostheses

An FYI for anyone else who doesn't know that exercise and silicone prostheses are a bad mix.

I have been wearing bilateral silicone prostheses since the end of July 2007.

I exercise almost everyday and frequently have my prostheses on when I do it.

On Sunday, I had sprung a leak on the seam of one of the prostheses.

I bought it in today to my prostheses lady and mentioned during our conversation that I exercise almost everyday.

She immediately asked if any of my exercises involve contracting and expanding the chest area .  When I said yes, she said that type of motion will cause the silicone prostheses to breakdown.  The backing pulls away from the prostheses and causes a crinkling sound (so that was the noise I was hearing !).

I was never warned not to exercise with the prostheses on.

In any case, the prostheses are still under warranty (the second one is going to leak soon ) and will be replaced at no cost (even though I unintentionally abused the product).

I will be also be buying some foam forms to wear during exercise.