With the barrage of obstacle course races popping up across the country and around the world encompassing short sprints and hurculean distances alike, it’s no wonder people are looking to improve their endurance and stamina. The thing is, “people tend to focus on cardio activities like running or cycling,” says Will Torres, a New York-based personal trainer and founder of the personal training studio, Willspace. “But that’s only a small part of the equation—you also need to improve your strength.”

When you build your leg muscles, Torres explains, you’ll better able to propel yourself further in every step you take while running. “The added muscle also helps absorb the impact that would otherwise put stress on your joints,” he adds. If you’re looking to take on a Tough Mudder, Spartan Race, or any other endurance race, take a look through Torres’ sneak tactics. You’re probably not doing these seven training techniques—but once you do, you’ll significantly boost your endurance and stamina.

SEE ALSO: 10 Tips for Endurance Training