Here's this other question that asks the question "According to Roman Catholicism, how old will our resurrection bodies be?"
The answers to the question talk along the line of that a persons physical body is resurrected. One of the answers includes this segment from the Catechism of the Catholic Church
The "resurrection of the flesh" (the literal formulation of the Apostles' Creed) means not only that the immortal soul will live on after death, but that even our "mortal body" will come to life again.
(emphasis added by me)
My understanding about Catholic beliefs, and about Christian beliefs in general, is that inside ourselves we have an immortal soul that continues living after the body is dead. Answers that talk about the Catholic view of this can be found for example here and here.
According to Catholicism, what do we need a resurrection for since we have an immortal soul that survives the death of the body?