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%\end{enumerate}  %\end{itemize}  Ensemble asteroseismology is providing outstanding results regarding the internal rotation of low-mass stars. It is important however to keep in mind that only 22$\%$ of the red giants sample analyzed by seismologists have identifiable mixed modes and rotational splittings \citep[313 out of 1399 stars, see e.g.]{Mosser:2012}.   In particular confusion between mixed modes and rotational splittings could in principle have led to a bias toward stars with slower rotating cores (e.g. stars that did spin down in due to  binary systems interactions  or with because of a  fossil magnetic fields). We believe these potential biases need to be carefully addressed as they could have important repercussion on the theoretical interpretations. It is interesting to consider what angular momentum transport mechanisms, not included in our models, might be responsible for the strong coupling implied by the asteroseismic observations. One candidate are gravity waves excited by the convective envelope during the RGB, as these can potentially lead to some transport of angular momentum. While a similar process has been discussed in the context of the Sun's rotational profile \citep{Zahn:1997,Charbonnel:2005}, more work needs to be done to understand the details of the excitation and propagation of gravity waves \citep[See e.g.][]{Lecoanet:2013,Rogers:2013}