You can do this stretch at work or home or at the gym. Most of us have very tight pecs/anterior shoulders and chest, here is a simple way to open them up. You can do this several times a day for 30-60 seconds. Do not push into any pain, just a mild stretch. If you are so tight that your hands feel numb or tingly, back off from the stretch.
Time for some Push Presses! Notice her trunk position and how her legs stay locked out after the initial dip/drive.