I do not think it is a good idea to do anything you are not comfortable with.
Maybe you and T can discuss first, why you don't think this is such a good idea. It sounds like you are not ready for this and need to go another route in therapy first?
I remember when T wanted to do some sort of anger release activity and I tried but finally just told him I didn't want to do it!! He was very in tune to my needs.
Good luck Gracey.