I sustained the injury doing back extensions, so I did eccentric back extensions. I held myself up with my hands, then slowly lowered myself all the way down. I also did them by standing and simply lowering my upper body. the difference between the two was that with the back extensions the stress on the tendon was more at the start of the movement, while for the standing stretches it was at the end of the movement. I think I got better results from the BE’s, though…