Common Dangerous Core Exercises
Every situp causes 730 pounds (3300 N) of spinal compression forces.
Research confirms no single core exercise challenges all of the abdominal musculature while not harming the back. Multiple exercises are required to strengthen the core and related muscles.
Unfortunately there are many inappropriate exercises unsafe for most people.
These exercises does not help relieve back pain, but instead increases low-back damage because of high compressive forces placed on the lower spine:
Leg raises: Lying flat on the floor, raising your while straight. These cause even higher spine compression than sit-ups.