Can anyone advise?
I've just started some online HIITs (Body Project, all low impact standing. I'm late 50s, overweight and not fit!).
They say 'engage your core, engage your core'. I understand what my 'core is' but should I be focusing on trying to hold my core 'together' and 'in line', as I do the exercises, or should I be actively clenching everything? Which is pretty hard to do consistently!
Advice, please?