As a certified personal trainer and "marathon maniac," Empowered Personal Training Studio founder Emily Knudson often saw other runners performing cardio workouts without achieving the results they expected. She realized they were missing a key ingredient in their fitness regimen: strength training. Unlike cardio exercise, building muscles lets the body continue to burn calories hours after exercises end. That’s why her six-week boot camps mix body-weight and hand-weight exercises into cardiovascular routines and high-intensity Q&A sessions. Empowered’s team of trainers includes other competitive marathoners as well as a triathlon coach, a competitive female bodybuilder, and a former Army infantryman and combat medic. Their studio's intimate setting of weight machines, medicine balls, and cycles contrasts with the impersonal vibe of a traditional large gym full of blaring TVs and barking dogs.