Depending on what you mean by "fail" and "stretching", that sounds a lot like eccentric training [0] (a.k.a. "negatives"). It's effective but notorious for causing delayed onset muscle soreness.

I trained myself to do pull-ups using this method, repeatedly lowering myself in a controlled motion from the top position while I was too weak to actually pull myself up.

[0] https://en.wikipedia.org/wiki/Eccentric_training