alot of people say we need 'rest' time. so doing the ab exercises every other day. or 2-3 times a week would be good.
for me, it was more about consistency. i'm better off doing squats every day before bed, than doing nothing bc i forgot. it's like the exercise routines. we find what works best for us.
if the goal is to build up the muscle more, then giving it time to repair and rest should be beneficial. this also allows for longer/more intense workouts.
also, if the intent is to work the abs, there's lots of exercises that work the abs other than crunches. holding in your core while you do another activity- biking, running, walking, boxing etc.
tip: to make the crunches more effective, do a crunch and 'hold' do as long as you can. then do crunches. i don't have to do as many this way. and always on my bed. much more comfortable.
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