Your body adapts to anything.
This is great, as it gets more effective and efficient at dealing with the stress placed on it.
But if you’re not careful certain adaptations can lead to imbalances.
Examples of common stresses that can cause imbalances:
Sitting. A lot of us sit for most of the day at computers. And yes, our bodies adapt to this. Specifically, sitting can lead to a weak posterior chain (glutes, hamstrings, lower back), shortened hip flexors, rounded shoulders, and a “forward” head.
Too much emphasis on “mirror” muscles and little emphasis on anything else. Working only beach muscles is a recipe for imbalance. Trust me I’ve been here, and it’s not pretty.
Too much of one form of cardio. If you only do one form of cardio exclusively, especially without resistance training and a good stretching program, imbalances can be created.
Three things that can help here:
Undue the damage of sitting. Use resistance training to strengthen the posterior chain, back, and neck.
Mix up your resistance training and cardio. Train ALL muscles and movements. Different forms of resistance training and cardio use different muscles in different ways. Try something new.
Stretch. Stretching can keep muscles, tendons, and ligaments from becoming too tight, and help loosen tight muscles tendons, and ligaments.