Are Hanging Sit Ups the Best for the Abs?
The hanging leg sit-up, or leg raise, looks like a powerful ab exercise. But, it can actually overwork your hip flexors and fail to give you the abs you desire.
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Exercise: How to do a sit-up properly, British GQ
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The benefits of upside-down situps, straight from a trainer
How many sit-ups you need to do to see results is initially very few and will continue to increase as you get stronger. How soon will I see results from sit-ups? How
Suspended Sit-Ups Hook your legs into a decline - The Exercist