If you are trying to build muscle while keeping up your cardiovascular fitness, you might wonder whether hitting the pavement or hopping on a bike is the better choice. When it comes to muscle development, cycling takes the win.
The Interference Effect Combining cardio and strength training can sometimes lead to the "interference effect," where aerobic exercise essentially blunts your muscle gains. Research consistently shows that running is much more likely to interfere with muscle development than cycling.
Why Running Blunts Growth Running involves high-impact, eccentric loading that causes significant muscle damage and inflammatory stress. This heightened stress forces your body to focus on repair rather than building new muscle tissue. Studies on muscle fibre growth specifically show that running blunts growth at the cellular level—particularly in slow-twitch fibres—more profoundly than cycling does.
Why Cycling is the Smarter Choice Cycling is a low-impact exercise that causes far less muscle damage. Additionally, the pedalling motion in cycling shares greater biomechanical similarities to multi-joint free-weight exercises, like squats, providing a better transfer of training for muscle growth. In fact, when looking at aerobic exercises in isolation, cycling appears to have the greatest hypertrophic (muscle-building) benefit out of all standard cardio modalities.
The Verdict If your main goal is muscle hypertrophy or maximizing strength, choose cycling over running to protect your hard-earned muscle gains.
Are you currently trying to balance cardio with a weightlifting routine, or are you focusing on one specific fitness goal right now?
