This grip (palms towards body) will work the biceps more than the traditional palms-facing-away grip.
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Grab chin-up bar with a shoulder-width grip, palms facing towards the torso.
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Pull yourself up, touching the bar with your chest or chin.
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Return slowly to starting position. Don't use momentum. Let your arms be fully straight at the starting position - don't do partial reps!
Too easy? There's lots of ways to make these harder..
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Add some weight, either by placing a dumbell between your feet, or using a custom-made belt.
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Take several seconds to perform the negative part of the exercise!
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Still too easy? Try them one-handed!
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Get someone to kick you in the stomach between reps (we saw Chuck Norris do this in a film once, so it must work..)