Sit-ups are great for strengthening the core but doing sit-up after sit-up gets a little boring and it's important to mix up the moves you use to train your core. With this in mind, we've found a five ...

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When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images If you have 10 minutes to spare and a couple of dumbbells to hand, then this ...