Let's begin with a story.
Over-trained with the leggies last season, to the point where my right shoulder and left spinal-flanking muscle (erectus spinae, for SS' benefit) were basically non-functional for cricketing purposes.
Looking back, I wasn't bowling with spikes which caused my lower half to over-twist beyond the usual leggie's pivot with no traction on the pitch. Shoulder was probably RSI.
Any CWers out there who have recovered from back/shoulder/postural injuries?