Practicing something as simple as 'easy seated pose' (comfortable seated cross legged pose) can cause an imbalance. Consider if in your easy pose you always keep the same leg crossed in front. One hip will be more open than the other. Conversely, if one hip is more open than the other, it is easier to sit that way. If you can work the other leg gradually into the front position you can balance out the hips. You really need to focus on working on specific areas like these gradually, over time.