A physical body in union with the spiritual so that they are one body.
Is that in Paul's writing?
A pneumatic body.
"In his supramundane state, Christ had been in “god-form” before his descent into “slave-form” (μορφὴ θεοῦ/μορφὴ δούλου, Phil 2:6–7), that is, into a body of flesh and blood. Presumably, in his postmortem manifestations—the only way that Paul would have experienced him—Jesus appeared in or as his pre-descent, god-form, a σῶμα πνευματικόv (which was the sort of body that characterized ancient divinity more generally). Transformation into pneumatic body, Paul taught, was guaranteed to believers whether living or dead: flesh and blood (“which cannot inherit the Kingdom of God”) would transition into spirit (1 Cor 15:50, cf. v. 44; Rom 8:29).4"
-Paula Fredriksen
""Reviewingthe days of creation, Philo observes that, when establishing the firmament, Godcreated “the most holy dwelling place of the manifest and visible gods” (θεῶνἐμφανῶν τε καὶ αἰσθητῶν, Opif. 7.27). This cosmic realm is made of “the purest ουσία [substance],” as befits its holy tenants, the stars and planets."
". . . transformed into bodies of πνεῦμα, Paul proclaims, the redeemed will enter their celestial commonwealth, ascending ἐν οὐρανοῖς above the lunar border, to God’s kingdom (Phil 3:20–21; 1 Cor 15:20-44).59
59 For Paul’s ideas on pneuma, star-bodies, and sidereal redemption, see esp. Thiessen, Paul and the Gentile Problem, 133–60. Believers will meet the returning Christ in the sublunar “air” (1 Thes 4:17) then, transforming into pneumatic body, they will ascend even higher, to the upper heavens (ἐν οὐρανοῖς, Phil 3:20)."
-Paula Fredriksen
Up means up.
It's foreign to us all, I think?
No. I'll pull up some quotes later if you like.