Do you work out regularly?
I'd imagine if you exercised/stretched your lower back and hip flexors regularly (deadlifts and squats) that you would be OK to sit for long periods of time.
I'd imagine if you exercised/stretched your lower back and hip flexors regularly (deadlifts and squats) that you would be OK to sit for long periods of time.
I guess I didn't notice any problems with hip flexors when sitting on a few very long flights recently, so maybe you're right.