It goes without saying that we should be aiming to minimise the risk of injury while training, whether that is a broken kneck or a scratch on the foot.
Please take all precautions for training and this includes: trimming finger and toe nails, removing jewellery, not training while under the influence of anything, controlling your throws and breakfalls and maintaining an awareness at all times of where you are and who is around you. This last point is particularly important if you are using weapons.
On the toe nail front, it is also beneficial to the owner of the toes to keep them short – I remember Joga having most of a big toe nail removed one night when he caught it on someone’s foot. Not a pleasant experience I am sure.