Some metal alkyls feature agostic interactions between a C-H bond on the alkyl group and the metal.  Such interactions are especially common for complexes of early transition metals in their highest oxidation states.
One determinant of the kinetic stability of metal-alkyl complexes is the presence of hydrogen at the position beta to the metal.  If such hydrogens are present and if the metal center is coordinatively unsaturated, then the complex can undergo beta-hydride elimination to form a metal-alkene complex:
These conversions are assumed to proceed via the intermediacy of agostic interactions.