strech

Hello, Is there a way to acheive modifier to a strap based extender such that instead the strap i can use a vaccum cap? I read that in the past there was auto extender company with a modifier that just works on any extender and switch it to vaccum based (without need of sleeves). I actually...

I started stretching a year ago. I was averaging 5-6 hours a day and after 6 months I started having really bad knee pain. At first, I wasn't sure if it was related, I'm pretty active although up there in age, but 4 months later I stopped stretching and the pain started to get better, although...