(literally) have one's hands behind one's back / (idiomatic) be arrested

a hand / a handle, grip / a paw, foreleg / a way of acting, means / (board games) a move, play

relaxing

to relax

back, behind, rear

to turn; to revolve; to spin / to circulate / to go around / to return / to prevail / (of a camera) to roll / to come around to (a point of view)

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

shield worn across one's back / support, backing / supporter, backer; patron, benefactor, sponsor