i've been working out 4 to 5 times a week over the past 2 months, and regularly since january. i've lost a ton of weight and my upper body is looking pumped like a basketball. however i feel like i've plateaued with my mid section. i've been doing a variance of a buncha moves including jackknifes, crunches, sit ups, reverse crunches, hanging knee raises, knee ins, double crunches, and bicycle crunches. i keep the abs tight for the duration of the move and keep with the quality, not quantity mindset and i've noticed a huge decline in improvement lately. i even train them dead last in my circuits so they're already pre-exhausted from providing stability in other exercises. so i was just wondering if anyone had some new moves for me or a little incite on how to get them up and working again like they were two months ago.