Ahmad Abas wrote:
Can't put my feet together without strain when lying on my back. (feet together close not just heels).
Tilt! Reset! . . . ! Are you saying that you can put your HEELS together without effort . . . but not your TOES? If so, look at hip ROTATORS, specifically piriformis.
Meanwhile, you might have given up flutter-kicking with a swim board due to back pain, but switching to a frog-kick could strain the hip abductors (re: gluteus medius).