From an experiment performed by Bret Contreras using EMG to compare the muscle activity of various ab and core exercises: Probably the most shocking result of this entire experiment was the level of rectus abdominis activity elicited by a bodyweight chin-up! It beat out any other abdominal exercise, weighted exercises and all, in mean and peak rectus abdominis activity. Chin-ups are ultimate anti-extension exercise for the low back. Some lifters let their lower back arch excessively, which is not only unsafe, but sub-optimal. If they brace their lower back and keep a straight line from their shoulders to knees, the core musculature has to work very hard to prevent the low back from extending. Today, after the 460 pullups, my abs are actually whats most sore on me.
Posted on: Thu, 03 Apr 2014 14:51:03 +0000
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