Strength is something that takes years to develop. Whereas cardio takes only a few weeks to start to see improvement. Why is this? Nutrition is the key to all of it. However, people sometimes lack understanding that strength and cardio need to live in harmony and need to be done equally. People will do some lifting and then run themselves to death to “lose weight”. Well, often that weight loss is muscle mass. Strength work needs time to settle in. Long, slow cardio needs to be done very sparingly if you are looking to maintain muscle mass and get stronger.