extra stength exercise cords?

[clint3612]

Hey guys I'm trying to rehab a herniated disk right now and I don't want to put alot of stress on my back while I'm trying to heal it. However, I don't want to stop exercising all together. I need a real heavy duty exercise cord for especially shoulders. I typicall military press 60-70 lbs dumbbells, so I need something strong enough to handle that. All of the ones at the sporting goods stores aren't strong enough. Any suggestions??

 

[jumpshot903]

The only ones i really know about are the ones i got for p90X They go up to 50Lbs resitance ive used em before there great bands but im not sure where to find 60-70lb bands