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We've said it before, and we'll say it again: when building a strong core, sit-ups aren't always the best option. Not only can regular sit-ups and crunches put strain on your lower back, you're only ...

I won't lie - I've never been a fan of the plank exercise, and in the summer last year, I decided I needed to work on my core strength. Looking at options, the dead bug exercise appealed the most, ...