Skip the crunches and strengthen your core with this 15-minute ab workout — no equipment needed

Sit-ups are probably the first ab exercise I learned to do and while they are great for engaging the core muscles, I find them to be a bit boring and overused in ab workouts.

While I don't actively avoid the humble sit-up when training my core, I'm thrilled when I find an ab circuit that's free of them, like this 15-minute workout from trainer James Stirling.

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