Lately i've been facing a problem with my abs, i do crunches, but i do not feel the burn, i increased the reps and duration, still the same thing, i did a lot of different ab exercises, still no use, i also did sit ups with 10kg weight to act as resistance, my arms got tired but my abs didn't feel a thing, what could the problem be, i also gave my abs a long rest before working out again (Ramadan started,where i can only eat at night). but ever since i came back, this problem started.. Please help