Amputees Support Group
Amputation is the removal of a body extremity by trauma or surgery. Many have undergone amputation or have been living with a missing limb since birth. In either case, life as an amputee can be challenging. This is the place to find others going through the same experiences as an amputee. Share your thoughts, troubles, and solutions with the community.
As for sit ups I would do some research on the net you could do reverse sit up that is where you bring your legs up to your chest or something like that, that way you wont need somebody to hold your leg down. Ab lounge could be a help to you also.
I hope this helps
Dennis