  The exact decomposition of the proton spin has been a much debated topic, on
the experimental as well as the theoretical side. In this talk we would like to
report on recent non-perturbative results and ongoing efforts to explore the
proton spin from lattice QCD. We present results for the relevant generalized
form factors from gauge field ensembles that feature a physical value of the
pion mass. These generalized form factors can be used to determine the total
spin and angular momentum carried by the quarks. In addition we present first
results for our ongoing effort to compute the angular momentum of the gluons in
the proton.
