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We review how the Regge trajectory of an elastic resonance can be obtainedjust from its pole position and coupling, by means of a dispersive formalism.This allows to deal correctly with the finite widths of resonances in Reggetrajectories. For the $\rho(770)$ meson this method leads to the ordinarylinear Regge trajectory with a universal slope. In contrast, for the $f_0(500)$meson, the resulting Regge trajectory is non-linear and with much smallerslope. This is another strong indication of the non-ordinary nature of thelightest scalar meson.

The non-ordinary Regge behavior of the $f_0(500)$ meson