The Body Solid Ab Slings are great for doing hanging leg raises. These slings helps tone and condition the entire abdominal area. The Ab Slings will not strain your lower back, infact  it will actually help your lower back by stretching the muscles and decompressing the spine. The slings include these solid steel locking carabiners that can hold a capacity of 10,000 pounds for each lock! Each arm slings is 8.5 inches wide and the pads are 1 inch thick.