I tried to do like 20 decline sit ups like two weeks ago and it left my core muscle's in pain since. Yesterday I was able to do 5 decline sit up before pain stress kicked in. With an extremely weak core, I can't really get into much of anything. I could only manage 10 push ups before my core gave out yet again.
For the most part, it's just strength stretching. Kind of yoga'ish, but not. I need those sinew and ligaments to strengthen up before working on any muscles for sure. And when the weather warms up...I can hit my intesity cardio to get the blood flow and lungs breathing.