Can Running Build Muscle? The Science Behind Cardio and Strength
Running is a popular form of exercise known for its cardiovascular benefits, stress relief, and bone density improvements. But can it also help build muscle? While running engages major lower-body muscles, its effectiveness for significant muscle growth is limited compared to resistance training. This article explores the science behind running and muscle development, backed by expert insights and evidence-based strategies.
Does Running Build Muscle?
Running primarily targets the lower body, activating muscles like the glutes, quads, hamstrings, and calves. However, it doesn’t provide the same level of mechanical tension required for substantial muscle hypertrophy (growth) as resistance training. According to Gabrielle Savary, CPT, and founder of Grow With Gab Fitness, “Running isn’t a muscle-building activity in the traditional sense.”
That said, beginners or those returning to running after a break may notice some muscle definition due to increased activity and improved nutrition. For long-term muscle growth, however, resistance training is essential. Gab Reznick, CPT, emphasizes that “progressive overload—gradually increasing weight or intensity—is critical for muscle development, which running alone can’t achieve.”
How to Combine Running and Strength Training
To maximize both cardiovascular health and muscle gains, experts recommend integrating strength training into your routine. Savary and Reznick suggest adding two to three strength sessions per week, focusing on compound movements like squats, deadlifts, and lunges. This approach enhances lower-body strength, reduces injury risk, and improves running performance.
Specific running workouts can also complement strength goals:
- Hill Sprints: Uphill running increases force production in the glutes, hamstrings, and calves, mimicking resistance training effects.
- Sprint Intervals: Short bursts of high-intensity effort target fast-twitch muscle fibers, boosting power and speed.
- Resisted Running: Using sleds or resistance bands adds external load, challenging muscles similarly to weightlifting.
- Trail Running: Uneven terrain improves balance, core stability, and lower-body coordination.
The Muscles You Work While Running
Proper running form engages nearly the entire body, with the following muscles playing key roles:
- Gluteus Maximus: Propels the body forward during each stride.
- Glute