Old school seems to be back in vogue, crunches are on the way out and real core strength is on the way back in, hence the popularity of Kettlebells and Jim Smith’s excellent work www.CombatCore.com
Here’s an exercise that’s been around for generations in the martial arts world. Fighters need a strong core, both for generating and for absorbing power. To this end kata’s/form’s such as Seisan and Sanchin were devised, I demo seisan here:
Fans of Dragon Door will recognise the first section of the form is based around “Power Breathing”, the second section is more about releasing the pent up tension. Oh and you get to practice your fighting techniques while you’re at it, how’s that for functional training?