Sylvester Stallone says the secret upside of a career rival is that they keep you moving forward

Source: Business Insider

Sylvester Stallone said his fierce competition with Arnold Schwarzenegger helped shape an era of action films. Todd Owyoung/NBC via Getty ImagesSylvester Stallone said his greatest rival pushed him to keep aiming higher. The "Rocky" star said he and Arnold Schwarzenegger antagonized each other in a creative way.