Your history, and personal factors are unknown, therefore, I answer in general - and not for you individually.
Our muscles follow the posture that we adapt every day (and night). For example: If you sit most of your working day, travel in a car, exercise on a bicycle, and sleep on your sides, chances are big that your muscles will shorten in the front of your body. After a few years, you can describe the symptoms that you have.
What can be done in this situation? Stand up to walk, and stretch backwards for 2 min - every 20 min of each sedentary day. Walk more during your days, sleep on your stomach and focus on maintaining a good posture.
If stiffness was causative to your symptoms, things will change for the better - in a few months.
All the best,
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