You could work with dumbbells using one or both hands when listening to conference calls. It's good to get up and move around a bit regularly, so one can make a point to do ten pushups, burpees, or jumping jacks every time you start to step away from your desk. Small sets of exercise add up and can be very beneficial.
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I walk in 25 minute segments, then take 5 minute breaks. Then I take longer breaks at intervals. (Pomodoro Technique)
When I'm tired, or when I need deep focus... I switch to sitting mode, and lower the desk.