Plank workout (7 moves). The plank is one of the best exercises for a flat toned stomach because it works all the muscles in your core including the rectus abdominus (the "six-pack muscles" you can see) transverse abdominus internal and external obliq
Plank workout (7 moves). The plank is one of the best exercises for a flat, toned stomach because it works all the muscles in your core, including the rectus abdominus (the "six-pack muscles" you can see), transverse abdominus, internal and external obliq
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