So abs are so sore after today's workout. All TRX for 1 hour. I didnt have a set workout per-se, just flowed from one exercise to another depending on the position I was in then did a few sets of abs with my feet in the straps about every 10min.
While doing ALL exercises you should be pulling your lower abs in towards your spine (navel-spine) and squeezing them, by doing this you should feel your abs working just as hard as whatever other muscle group that you're working primarily. Keep your back flat always, no dips or arches.