Thanks for writing in.
Pain in left groin area, pain in lower back. Based on these symptoms few exercises are:-
* Cat stretch
* Lying hamstring
* Pelvic tilt
* Partial curl
A detailed clinical examination by x-ray are warranted to narrow down the mentioned possibilities. Therefore I urge you to visit an orthopaedic surgeon
for clinical examination of lower back and investigations.
Hope I have answered your query. Let me know if you have any more concerns.