When I first started my c210 K six weeks ago or so, my core, principally my lower back was at times painful. Whilst it has improved, it is at time s(such as now) still tender, and I have to be careful how I sit.
But running is not an issue for the most part.
So I clearly need to work on my core & lower back.
Browsing YouTube I have come across various personal Trainer style videos, many of which seem to be sensibly timed (in terms of duration) and ability.
So I am intending to start using them.
But I was curious; has anyone else tried them?