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We discuss the recently presented Belle results on the decays $\Upsilon(5S)\to \pi \pi \pi \chi_{bJ}(1P)$. The data indicate that in addition to the$\omega$ emission, $\Upsilon(5S) \to \omega \chi_{bJ}$, there is a significantnon resonant background in the three pion spectrum. We suggest that a sizablefraction of this background may be associated with the cascade process$\Upsilon(5S) \to \pi Z_b \to \pi \rho \chi_b$ involving the $Z_b(10610)$ and$Z_b(10650)$ resonances. If confirmed by the data, this would be the firstobservation of transition from the $Z_b$ resonances to lower bottomonium withemission of a light meson state different from a single pion, which may providea new input in understanding of the internal dynamics of these resonances.

Contribution of $Z_b$ resonances to $\Upsilon(5S) \to \pi \pi \pi \chi_b$