Does anyone have any MOBs to help with most likely, an overworked psoas? Also, tips on how to more effectively perform situps with less hip flexor use would be appreciated. Current job duties require tons of high rep situps and flutter kicks, so new movements aren’t an option.  

Someone tell me if I have this right: By being lax on contracting the lower portion of your abs before you sit up, it places your lumbar spine into a little bit of overextension / compression, which causes back pain? So one really needs to focus on minimizes the space between the ground and the lumbar before rising up.