I weighed 174 pounds and 5 foot 11. I now am 149 due to diet and excersize. I do core and excersizes and ab roller and try to limit fat and eat protein. I am getting tone but still no six pack. I run and everything. Is it a matter of time? Been doing all this since March or so. Any advice? Keep on doing what I am doing or what am I doing something wrong? Please help!