When I first began practising yoga, the backs of my legs were so tight that, forget about touching my toes, I could hardly reach my knees. Over the years, with a lot of time, dedication and even more patience, these are the postures that opened my hamstrings and turned forward folds from dreaded to enjoyable.
Please stay at about 70% of your maximum, so that you leave 30% room to grow. Change often comes when we soften, not when we push. Level 1-2, no props needed.