a client complain that she/he injured during her/his last session. What shall I do?
Get specifics about the injury from your client and inquire about the other activities they have been engaging in.
I always remind my bootcampers and clients that active people have more aches and pains because they are active!
Keep your certifications current along with your liablilty insurance.
Make sure you have release forms signed by all of your clients prior to working with them and let them know that they will be sore and can expect it.