When your healed up toe touching, groin stretching and hurdler stretches may help you a lot. A lot of back injuries (not necessary your situation) come from lack of flexibility in the lumbar. Simply picking up too much stuff can unknowingly strain the muscles that are too tight and as we continue to unknowingly "grind through it" we have an "oh SH!) moment and the lower back is sprain and strained from nowhere.
Stretch stretch stretch
You are definitely correct. Even as a child, I was not very flexible, in spite of being major ly into sports. It finally caught up with me.