Your core is the centre of all your power. Of course – this is something that we’ve all heard before.  Striking by just swinging your arms is… well, it’s just a waste of time.  It has been several years since I’ve seen Sensei Ota and not much has changed – yet everything has changed.  It never ceases to amaze me;  Sensei Ota is 69 years old – but has the speed, agility and power of someone 1/2 his age.  A…