  We use the Fundamental Plane (FP) to measure the redshift evolution of the
dynamical mass-to-light ratio ($M_{\mathrm{dyn}}/L$) and the
dynamical-to-stellar mass ratio ($M_{\mathrm{dyn}}/M_*$). Although
conventionally used to study the properties of early-type galaxies, we here
obtain stellar kinematic measurements from the Large Early Galaxy Astrophysics
Census (LEGA-C) Survey for a sample of $\sim1400$ massive ($\log( M_*/M_\odot)
>10.5$) galaxies at $0.6<z<1.0$ that span a wide range in star formation
activity. In line with previous studies, we find a strong evolution in
$M_{\mathrm{dyn}}/L_g$ with redshift. In contrast, we find only a weak
dependence of the mean value of $M_{\mathrm{dyn}}/M_*$ on the specific star
formation rate, and a redshift evolution that likely is explained by
systematics. Therefore, we demonstrate that star-forming and quiescent galaxies
lie on the same, stable mass FP across $0<z<1$, and that the decrease in
$M_{\mathrm{dyn}}/L_g$ toward high redshift can be attributed entirely to
evolution of the stellar populations. Moreover, we show that the growth of
galaxies in size and mass is constrained to occur within the mass FP. Our
results imply either minimal structural evolution in massive galaxies since
$z\sim1$, or a tight coupling in the evolution of their morphological and
dynamical properties, and establish the mass FP as a tool for studying galaxy
evolution with low impact from progenitor bias.
