2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/175385We present a purely relativistic effect according to which asymmetric oscillations of a quasi-rigid body slow down or accelerate its fall in a gravitational background.3 pages, 2 figures. To appear in Phys Rev DGeneral Relativity and Quantum CosmologyAstrophysicstext