CPR aside, the full basics of first aid include knowing how to treat bruises, and concussions, treating mild to moderate wounds, and splinting broken bones, and is a must for every fitness trainer. While ideally no one under you should get injured in the line of training, accidents can and do happen. If you’re a martial arts instructor as well, this is a matter of course, but even if your training is all about fitness and something relatively low impact like aerobics, there are always those clumsy students that may take a bad fall or turn an ankle. Or even worse, for resistance training, there are those students who pile on more weight than they can manage and forget to lock the plates properly, dropping them on someone’s toe…