I ditched sit-ups for this standing ab exercise for a week — here's what happened to my core
Place your hands by your temples, with your elbows pointing out to the side. Lift your left knee, and at the same time, bend ...
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I ditched planks for zombie sit-ups for a week — here's what happened to my core
Bored of planks and crunches? Why not try mixing things up with a killer ab exercise that targets most of the muscles in your mid-section? The zombie sit-up isn’t for the faint of heart ...