A lot of good advice has already been posted. What helps many of my clients are simple isolation warm up exercises to activate certain muscles that have been “turned off” due to being in a lengthened state for a prolonged period of time (like the glutes from sitting at a desk all day) which can lead to postural disorders. A great page to follow on Facebook or Instagram is MoveU. They have hundreds of videos that can help just about anyone with simple exercises.