After that you can also use this exact position for some strength training for your arms by doing push aways.
This is when you push yourself away from the desk until you just about can’t reach, then pull yourself back to the desk.
Fit some more strength training in by keeping small wrist weights at your desk for doing squats while on conference calls.
You can also do arm lifts wearing the wrist weights while you’re wearing them, just switch sides if you’re holding the phone… or use speaker-phone.
If there is an exercise that’s part of your full workout, it most likely can be adapted for those workout breaks during the day!