When most people think of a strong core or achieving abs, the first exercise that comes to mind is often sit-ups. While ...
When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images Bored of planks and crunches? Why not try mixing things up with a killer ab ...
Find out how many sit-ups after 55 signal a strong, healthy core and use this 60-second test to track your strength over time.
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