I do bridges all the time. We spend so much of our lives sitting, bending forward and not enough time correcting that imbalance.
As Al stated, if you havent done them before go gently....full bridge can HURT a tight spine and the location of the adrenal glands means they can be activated during this pose if there is stress there.
Can I suggest if you are having a hard time with full bridge another good couple of transitional exercises....I do these as a warm up to full bridge each time
Warm up with cobra pose, then start the stretch with Camel or bow pose
If you are really tight in the back...and many people all, doing a bridge over a stability ball as a warmup stretch is a gentle way to move the back.
MTA: because it is rare I dont have more to say
"When I got too tired to run anymore I just pretended I wasnt tired and kept running anyway" - my daughter Age 7