Long Hoang, a 29-year-old San Jose native, likes to make his workouts as efficient as possible. He runs with a weighted vest, a mask that simulates high altitude training, and runs errands all in one workout.

Hoang saw this as a way to make the most of his time—witnesses saw it as a man in a bulletproof vest and gas mask shoving a package into a mailbox and running off. The ensuing panic yielded a call to local police who dispatched cops, firefighters and a bomb squad to the scene. Using a robot, authorities were able to defuse the situation by revealing that the box was filled with nonexplosive calendars and other inert materials.

After hearing of what had happened, friends of Hoang who were familiar with his unusual training habits, began calling him to ask if he had caused the scare. When he realized what had happened, he called the police and explained the situation.

“The guy said he was wearing a cardio mask," Sgt. Jason Dwyer told The Mercury News. "It was his cardio day and he was trying to lose weight."

Hoang claims this unusual attire, along with CrossFit, has been part of his workout routine for the past three months. CBS news asked him if in hindsight he realized how his outfit could scare people.

“Yeah,” he responded. “But when I’m in my little zone, and I’m just running and doing my thing, it wasn’t put into context.”

Next time you're in the zone, Hoang, we recommend making your context a treadmill.