Abs no more

I have decided to stop my personal 10 week ab challenge. This is week 7 and I am performing 700 repetitions per day. I have struggled mightily to obtain my daily numbers the last two weeks and having to force the numbers. To my physical detriment this is aggravating my lower back and making me uncomfortable performing the exercises and tight the rest of the day. I will continue to do my usual & modest 200-300 ab reps a day in my morning routine and continue with my 100 day burpee challenge as well as my normal my endurance and fitness pursuits. 

I never enjoy having to quit a challenge, especially so close to the end, only three weeks remaining. But a more dramatic injury at this point to my lower back would severely harm the efforts I am putting into a number of other areas, huge goals that I feel are much more important.