The 2018 FIFA World Cup, arguably the world’s biggest sporting event, kicks off June 14 in Russia. Soccer players aren’t the only ones feeling anxious. Andrés Cantor, the legendary Argentine soccer commentator known for his enthusiastic “Goooal!” shouts, is a ball of nerves.

The five-time Emmy-winner and Telemundo star isn’t worried about who wins or loses. He’s concerned with how he’ll find time to exercise while calling eight consecutive games in seven cities in eight days. “My spin instructor and trainer have been my...