How To Work Cardio Into Your Muscle-Building Workout Routine

When I first switched from Pilates to weightlifting, I booked a session with a personal trainer. I was told, verbatim, that cardio would prevent me from building the muscle I wanted. So, I stopped my weekly jogs and halted all incline walking on the treadmill out of caution.

I know I'm not the only one who was under this impression, so I'm here to report: An exercise and performance expert just told us on the mindbodygreen podcast that cardio is not, in fact, the enemy of muscle gains—if you do it right.

According to exercise and nutrition scientist Bill Campbell, Ph.D., you can certainly incorporate cardio into your muscle-building routine, just on a smaller scale. "For many years, a lot of people would say you cannot do cardio and resistance training at the same time because it will offset what you're trying to do in the weight room—and the research does not support that," he says.

Campbell adds that if you increase the volume too much, doing cardio every day for multiple hours, that's when you become susceptible to hindering your muscle gains. The reason, he explains, is that excessive cardio can tap into your body's overall recovery ability, which needs to be in tiptop shape for muscle growth.

However, doing cardio for 10, 20, 30 minutes, or even up to an hour each day, will not interfere with your progress in the weight room alone. You may be shorter on time or energy because of it, which could make completing those weightlifting workouts more difficult, but the cardio isn't going to directly decrease your chances of gaining lean muscle.

You can opt for quick bouts of cardio each time you work out (a quick jog, a 10-minute cycle session, etc.), sprinkle it in whenever your body craves quicker movement, or keep it as an isolated workout (one long run a week, a HIIT class, etc.).

Find a form of cardio you love so you can actually stick with it. "We have to find things that we will actually do—and what we will actually do is the best prescription," Campbell says.

Like any workout, be sure to ease into it if you're new to cardio. Rather than starting with a 5-mile long run, try speed walking or rucking and work your way up to more challenging exercises.

But remember: Building lean, long-lasting muscle takes energy, so you'll need to fuel up. If you add cardio to your routine, make sure you get enough calories and protein in your diet to keep you going.