2 crunches-per-second pace, 1000 times, taking a 10-sec break to do "the worm" after every 100 reps to alleviate any back discomfort. On the last 200, crunch with your legs down for your lower abs. Between sets, wiggle your spine from your hips to your neck a couple of times to massage your vertebrae which will relieve any discomfort.
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Pull Up Bar
