"Real speed and strength comes from complete relaxation and not tension, which weight lifting only promotes." The fastest man in the world, Usain Bolt, uses we

"Real speed and strength comes from complete relaxation and not tension, which weight lifting only promotes." The fastest man in the world, Usain Bolt, uses weight lifting as part of his training routine - as do elite athletes in almost all sports (with a particularly important role in those requiring high levels of strength and speed).