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The MUSE TIMER Survey has obtained high signal and high spatial resolutionintegral-field spectroscopy data of the inner $\sim6\times6$ kpc of 21 nearbymassive disc galaxies. This allows studies of the stellar kinematics of thecentral regions of massive disc galaxies that are unprecedented in spatialresolution. We confirm previous predictions from numerical and hydrodynamicalsimulations of the effects of bars and inner bars on stellar and gaseouskinematics, and also identify box/peanuts via kinematical signatures in mildlyand moderately inclined galaxies, including a box/peanut in a face-on innerbar. In 20/21 galaxies we find inner discs and show that their properties arefully consistent with the bar-driven secular evolution picture for theirformation. In addition, we show that these inner discs have, in the regionwhere they dominate, larger rotational support than the main galaxy disc, anddiscuss how their stellar population properties can be used to estimate when incosmic history the main bar formed. Our results are compared with photometricstudies in the context of the nature of galaxy bulges and we show that innerdiscs are identified in image decompositions as photometric bulges withexponential profiles (i.e., S\'ersic indices near unity).

Kinematical Signatures of Disc Instabilities and Secular Evolution in the MUSE TIMER Survey