We as a society are slowly killing ourselves by too much sitting. Hip and shoulder mobility problems ensue due to long term sitting.
Fortunately, there are ways to minimize the damage.
To start, If you get on a phone call, stand up. Maybe even set an alarm to go off every 10-15 minutes. These are quick strategies.
Below is a fantastic exercise to help with hip and shoulder mobility called the Thoracic Bridge stretch. Check it out.