We know that Jesus really resurrected, that is not remained just a flesh-less spirit.
But what does this mean? What is the difference between being a ghost or a real man, when it comes to a body which is able to enter into a room with closed doors, to change the face to be unrecognized, but also able to be touched, and even to eat?
(1Pet. 3:18) “being put to death in the flesh, but made alive in the spirit”.
My interpretation is the following: Jesus Christ is the “living God” as prophesied in the Old Testament. Yes, because every verse of Old Testament witnesses about Jesus, accordingly (Jn. 5:39) “You search the Scriptures, because you think that in them you have eternal life; and these are they which testify about me.”
To be living it means that he can touch, get an item in his hands, build a mechanism such as a clock from physical details. This means that He is able to operate in our world, unlike flesh-less spirits which at most are able only to communicate with living people and ask them to do something in this material world, not to act in the world directly.
This means that Jesus Christ is in a spiritual body after His resurrection, but His spirit is so powerful that he can be called truly alive.