What would cause tight hamstrings, painful flutes and lower back when bending? not from a physical activity.

Tension: Could be tension, lack of flexibility, or rarely, a medical/neurologic problem. If this persists, see your doctor.

These symptoms sou--: Nd typical of inactivity for a long time. You need to start moving and do some bending/extending of the back/ /hips/knees. Start slow ; gradually build up the reps/frequency, so to develop muscles ; get them loose (limbered) so when you do these activities, they are not so painful or tight. Muscle relaxers may also help, but i believe the exercises to stretch ; strengthen will help more. Good luck.