consult your doctor or physical therapist before attempting back extensions. The post How to do back extensions: Pro tips ...

can cause back pain. When you’re injured, you may need to skip a workout or two, impeding your progress. So to prevent injury and to get the best results over time, do fewer crunches with good ...

At this age, longer work hours and more time sitting can do a number on your back and hips, she said but planks can help prevent problems from developing. Aim for a 1-minute hold or longer.