My stomach pooches when I extend my legs w ab work. I am lifting my head neck and shoulders when my legs go to 45*,I have even tried lowering the spring tension. I have no trouble keeping the tummy scoop when my legs are in table top position. I am 5 weeks new to reformer Pilates, but I have always been very active run bike kayak light weights. Do I need to avoid leg extensions w ab work and just stay in table top w legs or can I modify in another way to get stronger. I want to master this tummy scoop.