I use the ab straps maybe once or twice a week for knee to elbow raises which are pretty controlled without any swinging or demand on the straps. They maintain posture great but the threading is worrying me that they will soon rip as im hanging. considering im the only user and the little use out of them i have done it concerns me why they advertise to be so strong yet only supply a 90 day warranty. I had to call Harbinger myself and was told they dont cover normal wear and tear but i dont even know if u would call the little use i put on them normal (no other users). I do think they maintain my balance well but just think someone would do better with a product that last longer or has a better warranty to the bad threading issue.