30 Day Plank Challenge Free. That challenge ended up being a real struggle. Do you want to learn how to do different planks?
It has different types of planks that will tone your tummy.
The plank is one of the best exercises to strengthen your core, which is more than just your abdominals.
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Vlad's 30-day plank challenge
No equipment or special type of machinery needed, just your body and good ole gravity. Do you want to learn how to do different planks? I plan on doing these a month at a time.