Cardio is excellent for heart health, circulation, lung function, and mental well-being. The problem begins when it becomes excessive and replaces everything else.
Many women over 40 unknowingly enter a cycle of:
Doing more cardio
Eating too little
Losing muscle instead of fat
Feeling constantly tired
Seeing fewer results
Excessive cardio can increase cortisol, the body’s primary stress hormone. When cortisol remains elevated for long periods, it may contribute to stubborn belly fat, fatigue, cravings, and disrupted sleep.
Research published by the US Office on Women’s Health notes that aging women naturally lose muscle mass over time, making strength preservation especially important after 40.
This is where many traditional fitness plans fail women. They focus heavily on calorie burning but ignore muscle protection.
Muscle matters far more than many people realise. It supports metabolism, balance, blood sugar control, bone strength, and long-term mobility. Losing it too quickly can make aging physically harder.