My back is generally pretty flexible when it comes to back bends, and has never really caused me much issue. Recently though my lower back has been giving me achiness days after doing deep back bending, especially if I have to bend forwards at all (my legs are tight in comparison to the rest of my body, so forward bending is my usual weakspot). Doing bends like [this](https://imgur.com/M0QTPKx) and [this](https://imgur.com/BR2Mzs8) give me no issues at the time and are comfortable positions for me, but it's the days after where the aching flares up and will take another few days to return to normal. I'm wondering if my core and back muscles aren't strong enough to support bending so far, or if the problem lies in tight legs and weak forward bends. I do try to do some counter bending afterwards to stretch things out, but getting the same extreme bend going forward is extremely difficult. Do any of you more experienced guys have any ideas to what could be causing the issue or what stretches could help even things out?